1. What is the periodic table?
Arrangement of elements by atomic number.
2. Who proposed Dobereinerās triads?
Johann Dobereiner.
3. What is a Dobereinerās triad?
Three elements with similar properties.
4. What is the rule of Dobereinerās triads?
Middle elementās atomic mass averages others.
5. Give an example of Dobereinerās triad.
Li, Na, K.
6. Who proposed the Law of Octaves?
John Newlands.
7. What is the Law of Octaves?
Every eighth element repeats properties.
8. What was a limitation of Newlandsā law?
Failed beyond calcium.
9. Who developed the periodic table?
Dmitri Mendeleev.
10. What was Mendeleevās periodic law?
Properties are periodic with atomic mass.
11. What is a group in Mendeleevās table?
Vertical column of elements.
12. What is a period in Mendeleevās table?
Horizontal row of elements.
13. How many groups in Mendeleevās table?
Eight groups.
14. How many periods in Mendeleevās table?
Seven periods.
15. What was Mendeleevās contribution?
Predicted unknown elements.
16. Name an element predicted by Mendeleev.
Eka-silicon (Germanium).
17. What was a limitation of Mendeleevās table?
Position of isotopes.
18. Who proposed the modern periodic law?
Henry Moseley.
19. What is the modern periodic law?
Properties depend on atomic number.
20. How many groups in modern periodic table?
18 groups.
21. How many periods in modern periodic table?
7 periods.
22. What is the first period called?
Shortest period.
23. How many elements in period 1?
2 elements.
24. How many elements in period 2?
8 elements.
25. How many elements in period 3?
26. How many elements in period 4?
18 elements.
27. How many elements in period 5?
28. How many elements in period 6?
32 elements.
29. How many elements in period 7?
32 elements (incomplete).
30. What are s-block elements?
Elements with valence electrons in s-orbital.
31. Which groups are s-block?
Groups 1 and 2.
32. What are p-block elements?
Elements with valence electrons in p-orbital.
33. Which groups are p-block?
Groups 13 to 18.
34. What are d-block elements?
Elements with valence electrons in d-orbital.
35. Which groups are d-block?
Groups 3 to 12.
36. What are f-block elements?
Elements with valence electrons in f-orbital.
37. Where are f-block elements placed?
Bottom of periodic table.
38. What are lanthanides?
Elements 58 to 71.
39. What are actinides?
Elements 90 to 103.
40. What are alkali metals?
Group 1 elements (except H).
41. Name the alkali metals.
Li, Na, K, Rb, Cs, Fr.
42. What are alkaline earth metals?
Group 2 elements.
43. Name the alkaline earth metals.
Be, Mg, Ca, Sr, Ba, Ra.
44. What are halogens?
Group 17 elements.
45. Name the halogens.
F, Cl, Br, I, At.
46. What are noble gases?
Group 18 elements.
47. Name the noble gases.
He, Ne, Ar, Kr, Xe, Rn.
48. What is atomic radius?
Half the distance between nuclei.
49. How does atomic radius vary in a period?
Decreases left to right.
50. Why does atomic radius decrease in a period?
Increasing nuclear charge.
51. How does atomic radius vary in a group?
Increases down the group.
52. Why does atomic radius increase down a group?
More electron shells.
53. What is ionic radius?
Radius of an ion.
54. How does cation radius compare to atom?
Cation is smaller.
55. Why is cation smaller than atom?
Loss of electron shell.
56. How does anion radius compare to atom?
Anion is larger.
57. Why is anion larger than atom?
Increased electron repulsion.
58. What is ionization energy?
Energy to remove an electron.
59. How does ionization energy vary in a period?
Increases left to right.
60. Why does ionization energy increase in a period?
Stronger nuclear attraction.
61. How does ionization energy vary in a group?
Decreases down the group.
62. Why does ionization energy decrease down a group?
Increased shielding effect.
63. What is second ionization energy?
Energy to remove second electron.
64. Why is second ionization energy higher?
Stronger nuclear pull.
65. What is electron gain enthalpy?
Energy change when electron added.
66. How does electron gain enthalpy vary in a period?
More negative left to right.
67. Why does electron gain enthalpy become more negative?
68. How does electron gain enthalpy vary in a group?
Less negative down the group.
69. Why does electron gain enthalpy decrease down a group?
Increased atomic size.
70. What is electronegativity?
Ability to attract electrons.
71. How does electronegativity vary in a period?
72. Why does electronegativity increase in a period?
Higher nuclear charge.
73. How does electronegativity vary in a group?
74. Why does electronegativity decrease down a group?
75. Who proposed electronegativity?
Linus Pauling.
76. What is the Pauling scale?
Scale for electronegativity.
77. What is the electronegativity of fluorine?
4.0.
78. What is valence?
Combining capacity of element.
79. What is the valence of alkali metals?
1.
80. What is the valence of alkaline earth metals?
2.
81. What is the valence of halogens?
82. What is the valence of noble gases?
0.
83. What are representative elements?
s- and p-block elements.
84. What are transition elements?
d-block elements.
85. What are inner transition elements?
f-block elements.
86. What is metallic character?
Tendency to lose electrons.
87. How does metallic character vary in a period?
88. Why does metallic character decrease in a period?
89. How does metallic character vary in a group?
90. Why does metallic character increase down a group?
Lower ionization energy.
91. What is non-metallic character?
Tendency to gain electrons.
92. How does non-metallic character vary in a period?
93. How does non-metallic character vary in a group?
94. What are metalloids?
Elements with mixed properties.
95. Name a metalloid.
Silicon.
96. Where are metalloids located?
Border of metals, non-metals.
97. What is a diagonal relationship?
Similarity between diagonal elements.
98. Give an example of diagonal relationship.
Li and Mg.
99. Why does diagonal relationship occur?
Similar charge-to-radius ratio.
100. What is periodicity?
Repetition of properties.
101. What causes periodicity?
Similar electron configurations.
102. What is the atomic number of H?
103. What is the atomic number of He?
104. What is the atomic number of Li?
3.
105. What is the atomic number of Be?
4.
106. What is the atomic number of B?
5.
107. What is the atomic number of C?
6.
108. What is the atomic number of N?
7.
109. What is the atomic number of O?
8.
110. What is the atomic number of F?
9.
111. What is the atomic number of Ne?
10.
112. What is the atomic number of Na?
11.
113. What is the atomic number of Mg?
12.
114. What is the atomic number of Al?
13.
115. What is the atomic number of Si?
14.
116. What is the atomic number of P?
15.
117. What is the atomic number of S?
16.
118. What is the atomic number of Cl?
17.
119. What is the atomic number of Ar?
18.
120. What is the atomic number of K?
19.
121. What is the atomic number of Ca?
20.
122. What is the atomic number of Sc?
21.
123. What is the atomic number of Zn?
30.
124. What is the atomic number of Ga?
31.
125. What is the atomic number of Kr?
36.
126. What is the atomic number of Rb?
37.
127. What is the atomic number of Sr?
38.
128. What is the atomic number of Cd?
48.
129. What is the atomic number of In?
49.
130. What is the atomic number of Xe?
54.
131. What is the atomic number of Cs?
55.
132. What is the atomic number of Ba?
56.
133. What is the atomic number of La?
57.
134. What is the atomic number of Lu?
71.
135. What is the atomic number of Hf?
72.
136. What is the atomic number of Hg?
80.
137. What is the atomic number of Tl?
81.
138. What is the atomic number of Rn?
86.
139. What is the atomic number of Fr?
87.
140. What is the atomic number of Ra?
88.
141. What is the atomic number of Ac?
89.
142. What is the atomic number of Lr?
103.
143. What is the group of H?
Group 1.
144. What is the period of H?
Period 1.
145. What is the group of Na?
146. What is the period of Na?
Period 3.
147. What is the group of Mg?
Group 2.
148. What is the period of Mg?
149. What is the group of Al?
Group 13.
150. What is the period of Al?
151. What is the group of Cl?
Group 17.
152. What is the period of Cl?
153. What is the group of Ca?
154. What is the period of Ca?
Period 4.
155. What is the group of Fe?
Group 8.
156. What is the period of Fe?
157. What is the group of Br?
158. What is the period of Br?
159. What is the group of Cs?
160. What is the period of Cs?
Period 6.
161. What is the group of Ba?
162. What is the period of Ba?
163. What is the group of I?
164. What is the period of I?
Period 5.
165. What is the group of Rn?
Group 18.
166. What is the period of Rn?
167. What is the block of Na?
s-block.
168. What is the block of Cl?
p-block.
169. What is the block of Fe?
d-block.
170. What is the block of Ce?
f-block.
171. What is the valence of Na?
172. What is the valence of Mg?
173. What is the valence of Al?
174. What is the valence of Si?
175. What is the valence of P?
3 or 5.
176. What is the valence of S?
2, 4, or 6.
177. What is the valence of Cl?
178. What is the valence of Ar?
179. What is the electronegativity of Na?
0.9.
180. What is the electronegativity of Cl?
3.0.
181. What is the electronegativity of O?
3.5.
182. What is the electronegativity of N?
183. What is the electronegativity of C?
2.5.
184. What is the electronegativity of H?
2.1.
185. Which element has highest electronegativity?
Fluorine.
186. Which element has lowest electronegativity?
Francium.
187. What is the ionization energy of Na?
496 kJ/mol.
188. What is the ionization energy of Cl?
1251 kJ/mol.
189. Which group has lowest ionization energy?
190. Which group has highest ionization energy?
191. What is the electron gain enthalpy of Cl?
-349 kJ/mol.
192. What is the electron gain enthalpy of F?
-328 kJ/mol.
193. Why is Fās electron gain enthalpy less negative than Cl?
Smaller size, more repulsion.
194. What is the atomic radius of Li?
152 pm.
195. What is the atomic radius of Na?
186 pm.
196. What is the atomic radius of F?
72 pm.
197. What is the atomic radius of Cl?
99 pm.
198. Which element has largest atomic radius?
199. Which element has smallest atomic radius?
Helium.
200. What is the ionic radius of Naāŗ?
102 pm.
201. What is the ionic radius of Clā»?
181 pm.
202. What is the ionic radius of MgĀ²āŗ?
203. What is the ionic radius of OĀ²ā»?
140 pm.
204. What are isoelectronic species?
Same number of electrons.
205. Give an example of isoelectronic species.
Naāŗ, MgĀ²āŗ, Fā».
206. How does ionic radius vary in isoelectronic species?
Decreases with higher nuclear charge.
207. What is the group of Sc?
Group 3.
208. What is the period of Sc?
209. What is the group of Zn?
Group 12.
210. What is the period of Zn?
211. What is the group of Ga?
212. What is the period of Ga?
213. What is the group of Kr?
214. What is the period of Kr?
215. What is the valence of Sc?
216. What is the valence of Zn?
217. What is the valence of Ga?
218. What is the valence of Kr?
219. What is the electronegativity of Sc?
1.3.
220. What is the electronegativity of Zn?
1.6.
221. What is the electronegativity of Ga?
1.8.
222. What is the electronegativity of Kr?
223. What is the ionization energy of Sc?
633 kJ/mol.
224. What is the ionization energy of Zn?
906 kJ/mol.
225. What is the ionization energy of Ga?
579 kJ/mol.
226. What is the ionization energy of Kr?
1351 kJ/mol.
227. What is the atomic radius of Sc?
162 pm.
228. What is the atomic radius of Zn?
134 pm.
229. What is the atomic radius of Ga?
135 pm.
230. What is the atomic radius of Kr?
88 pm.
231. What is the group of Rb?
232. What is the period of Rb?
233. What is the group of Sr?
234. What is the period of Sr?
235. What is the group of In?
236. What is the period of In?
237. What is the group of Xe?
238. What is the period of Xe?
239. What is the valence of Rb?
240. What is the valence of Sr?
241. What is the valence of In?
242. What is the valence of Xe?
243. What is the electronegativity of Rb?
0.8.
244. What is the electronegativity of Sr?
1.0.
245. What is the electronegativity of In?
246. What is the electronegativity of Xe?
2.6.
247. What is the ionization energy of Rb?
403 kJ/mol.
248. What is the ionization energy of Sr?
550 kJ/mol.
249. What is the ionization energy of In?
558 kJ/mol.
250. What is the ionization energy of Xe?
1170 kJ/mol.
251. What is the atomic radius of Rb?
248 pm.
252. What is the atomic radius of Sr?
215 pm.
253. What is the atomic radius of In?
167 pm.
254. What is the atomic radius of Xe?
108 pm.
255. What is the group of La?
256. What is the period of La?
257. What is the group of Hg?
258. What is the period of Hg?
259. What is the group of Tl?
260. What is the period of Tl?
261. What is the group of Rn?
262. What is the period of Rn?
263. What is the valence of La?
264. What is the valence of Hg?
265. What is the valence of Tl?
266. What is the valence of Rn?
267. What is the electronegativity of La?
1.1.
268. What is the electronegativity of Hg?
1.9.
269. What is the electronegativity of Tl?
270. What is the electronegativity of Rn?
2.2.
271. What is the ionization energy of La?
538 kJ/mol.
272. What is the ionization energy of Hg?
1007 kJ/mol.
273. What is the ionization energy of Tl?
589 kJ/mol.
274. What is the ionization energy of Rn?
1037 kJ/mol.
275. What is the atomic radius of La?
187 pm.
276. What is the atomic radius of Hg?
151 pm.
277. What is the atomic radius of Tl?
170 pm.
278. What is the atomic radius of Rn?
120 pm.
279. What is the group of Fr?
280. What is the period of Fr?
Period 7.
281. What is the group of Ra?
282. What is the period of Ra?
283. What is the valence of Fr?
284. What is the valence of Ra?
285. What is the electronegativity of Fr?
0.7.
286. What is the electronegativity of Ra?
287. What is the ionization energy of Fr?
380 kJ/mol.
288. What is the ionization energy of Ra?
510 kJ/mol.
289. What is the atomic radius of Fr?
260 pm.
290. What is the atomic radius of Ra?
223 pm.
291. What is the block of Fr?
292. What is the block of Ra?
293. What is the block of La?
294. What is the block of Hg?
295. What is the block of Tl?
296. What is the block of Rn?
297. What is the electron configuration of Na?
[Ne] 3sĀ¹.
298. What is the electron configuration of Cl?
[Ne] 3sĀ² 3pāµ.
299. What is the electron configuration of Fe?
[Ar] 3dā¶ 4sĀ².
300. What is the electron configuration of Ce?
[Xe] 4fĀ¹ 5dĀ¹ 6sĀ².
301. What is the electron configuration of Rb?
[Kr] 5sĀ¹.
302. What is the electron configuration of Xe?
[Kr] 4dĀ¹ā° 5sĀ² 5pā¶.
303. What is the electron configuration of La?
[Xe] 5dĀ¹ 6sĀ².
304. What is the electron configuration of Rn?
[Xe] 4fĀ¹ā“ 5dĀ¹ā° 6sĀ² 6pā¶.
305. How many valence electrons in Na?
306. How many valence electrons in Cl?
307. How many valence electrons in Fe?
308. How many valence electrons in Ce?
309. How many valence electrons in Rb?
310. How many valence electrons in Xe?
311. How many valence electrons in La?
312. How many valence electrons in Rn?
313. What is the metallic character of Na?
High.
314. What is the metallic character of Cl?
Low.
315. What is the metallic character of Cs?
Very high.
316. What is the metallic character of F?
Very low.
317. What is the non-metallic character of O?
318. What is the non-metallic character of K?
319. Is Si a metal or non-metal?
Metalloid.
320. Is Ge a metal or non-metal?
321. Is As a metal or non-metal?
322. Is Sb a metal or non-metal?
323. Is Te a metal or non-metal?
324. Is B a metal or non-metal?
325. What is the diagonal relationship between Be and Al?
Similar properties.
326. What is the diagonal relationship between B and Si?
327. What is the electron gain enthalpy of O?
-141 kJ/mol.
328. What is the electron gain enthalpy of S?
-200 kJ/mol.
329. What is the ionization energy of O?
1314 kJ/mol.
330. What is the ionization energy of S?
1000 kJ/mol.
331. What is the atomic radius of O?
66 pm.
332. What is the atomic radius of S?
104 pm.
333. What is the electronegativity of S?
334. What is the valence of O?
335. What is the electron configuration of O?
[He] 2sĀ² 2pā“.
336. What is the electron configuration of S?
[Ne] 3sĀ² 3pā“.
337. How many valence electrons in O?
338. How many valence electrons in S?
339. What is the group of O?
Group 16.
340. What is the period of O?
Period 2.
341. What is the group of S?
342. What is the period of S?
343. What is the block of O?
344. What is the block of S?
345. What is the electron configuration of K?
[Ar] 4sĀ¹.
346. What is the electron configuration of Ca?
[Ar] 4sĀ².
347. How many valence electrons in K?
348. How many valence electrons in Ca?
349. What is the electronegativity of K?
350. What is the electronegativity of Ca?
351. What is the ionization energy of K?
419 kJ/mol.
352. What is the ionization energy of Ca?
590 kJ/mol.
353. What is the atomic radius of K?
227 pm.
354. What is the atomic radius of Ca?
197 pm.
355. What is the group of K?
356. What is the period of K?
357. What is the group of Ca?
358. What is the period of Ca?
359. What is the block of K?
360. What is the block of Ca?
361. What is the electron configuration of P?
[Ne] 3sĀ² 3pĀ³.
362. What is the electron configuration of N?
[He] 2sĀ² 2pĀ³.
363. How many valence electrons in P?
364. How many valence electrons in N?
365. What is the electronegativity of P?
366. What is the electronegativity of N?
367. What is the ionization energy of P?
1012 kJ/mol.
368. What is the ionization energy of N?
1402 kJ/mol.
369. What is the atomic radius of P?
110 pm.
370. What is the atomic radius of N?
70 pm.
371. What is the group of P?
Group 15.
372. What is the period of P?
373. What is the group of N?
374. What is the period of N?
375. What is the block of P?
376. What is the block of N?
377. What is the electron configuration of F?
[He] 2sĀ² 2pāµ.
378. What is the electron configuration of Br?
[Ar] 3dĀ¹ā° 4sĀ² 4pāµ.
379. How many valence electrons in F?
380. How many valence electrons in Br?
381. What is the electronegativity of F?
382. What is the electronegativity of Br?
2.8.
383. What is the ionization energy of F?
1681 kJ/mol.
384. What is the ionization energy of Br?
1140 kJ/mol.
385. What is the atomic radius of F?
386. What is the atomic radius of Br?
114 pm.
387. What is the group of F?
388. What is the period of F?
389. What is the group of Br?
390. What is the period of Br?
391. What is the block of F?
392. What is the block of Br?
393. What is the electron configuration of He?
1sĀ².
394. What is the electron configuration of Ne?
[He] 2sĀ² 2pā¶.
395. How many valence electrons in He?
396. How many valence electrons in Ne?
397. What is the electronegativity of He?
Not defined.
398. What is the electronegativity of Ne?
399. What is the ionization energy of He?
2372 kJ/mol.
400. What is the ionization energy of Ne?
2081 kJ/mol.
401. What is the atomic radius of He?
31 pm.
402. What is the atomic radius of Ne?
403. What is the group of He?
404. What is the period of He?
405. What is the group of Ne?
406. What is the period of Ne?
407. What is the block of He?
408. What is the block of Ne?
409. What is the electron configuration of B?
[He] 2sĀ² 2pĀ¹.
410. What is the electron configuration of Al?
[Ne] 3sĀ² 3pĀ¹.
411. How many valence electrons in B?
412. How many valence electrons in Al?
413. What is the electronegativity of B?
2.0.
414. What is the electronegativity of Al?
1.5.
415. What is the ionization energy of B?
801 kJ/mol.
416. What is the ionization energy of Al?
577 kJ/mol.
417. What is the atomic radius of B?
85 pm.
418. What is the atomic radius of Al?
143 pm.
419. What is the group of B?
420. What is the period of B?
421. What is the group of Al?
422. What is the period of Al?
423. What is the block of B?
424. What is the block of Al?
425. What is the electron configuration of C?
[He] 2sĀ² 2pĀ².
426. What is the electron configuration of Si?
[Ne] 3sĀ² 3pĀ².
427. How many valence electrons in C?
428. How many valence electrons in Si?
429. What is the electronegativity of C?
430. What is the electronegativity of Si?
431. What is the ionization energy of C?
1086 kJ/mol.
432. What is the ionization energy of Si?
786 kJ/mol.
433. What is the atomic radius of C?
77 pm.
434. What is the atomic radius of Si?
117 pm.
435. What is the group of C?
Group 14.
436. What is the period of C?
437. What is the group of Si?
438. What is the period of Si?
439. What is the block of C?
440. What is the block of Si?
441. What is the electron configuration of Be?
[He] 2sĀ².
442. What is the electron configuration of Mg?
[Ne] 3sĀ².
443. How many valence electrons in Be?
444. How many valence electrons in Mg?
445. What is the electronegativity of Be?
446. What is the electronegativity of Mg?
1.2.
447. What is the ionization energy of Be?
899 kJ/mol.
448. What is the ionization energy of Mg?
738 kJ/mol.
449. What is the atomic radius of Be?
112 pm.
450. What is the atomic radius of Mg?
160 pm.
451. What is the group of Be?
452. What is the period of Be?
453. What is the group of Mg?
454. What is the period of Mg?
455. What is the block of Be?
456. What is the block of Mg?
457. What is the electron configuration of Li?
[He] 2sĀ¹.
458. What is the electron configuration of Cs?
[Xe] 6sĀ¹.
459. How many valence electrons in Li?
460. How many valence electrons in Cs?
461. What is the electronegativity of Li?
462. What is the electronegativity of Cs?
463. What is the ionization energy of Li?
520 kJ/mol.
464. What is the ionization energy of Cs?
376 kJ/mol.
465. What is the atomic radius of Li?
466. What is the atomic radius of Cs?
262 pm.
467. What is the group of Li?
468. What is the period of Li?
469. What is the group of Cs?
470. What is the period of Cs?
471. What is the block of Li?
472. What is the block of Cs?
473. What is the electron configuration of Ar?
[Ne] 3sĀ² 3pā¶.
474. What is the electron configuration of Kr?
[Ar] 3dĀ¹ā° 4sĀ² 4pā¶.
475. How many valence electrons in Ar?
476. How many valence electrons in Kr?
477. What is the electronegativity of Ar?
478. What is the electronegativity of Kr?
3. Tas defined.
479. What is the ionization energy of Ar?
1520 kJ/mol.
480. What is the ionization energy of Kr?
481. What is the atomic radius of Ar?
71 pm.
482. What is the atomic radius of Kr?
483. What is the group of Ar?
484. What is the period of Ar?
485. What is the group of Kr?
486. What is the period of Kr?
487. What is the block of Ar?
488. What is the block of Kr?
489. What is the electron configuration of Sc?
[Ar] 3dĀ¹ 4sĀ².
490. What is the electron configuration of Zn?
[Ar] 3dĀ¹ā° 4sĀ².
491. How many valence electrons in Sc?
492. How many valence electrons in Zn?
493. What is the electronegativity of Sc?
494. What is the electronegativity of Zn?
495. What is the ionization energy of Sc?
496. What is the ionization energy of Zn?
497. What is the atomic radius of Sc?
498. What is the atomic radius of Zn?
499. What is the group of Sc?
500. What is the period of Sc?
501. What is the group of Zn?
502. What is the period of Zn?
503. What is the block of Sc?
504. What is the block of Zn?
505. What is the electron configuration of Ga?
[Ar] 3dĀ¹ā° 4sĀ² 4pĀ¹.
506. What is the electron configuration of In?
[Kr] 4dĀ¹ā° 5sĀ² 5pĀ¹.
507. How many valence electrons in Ga?
508. How many valence electrons in In?
509. What is the electronegativity of Ga?
510. What is the electronegativity of In?
511. What is the ionization energy of Ga?
512. What is the ionization energy of In?
513. What is the atomic radius of Ga?
514. What is the atomic radius of In?
515. What is the group of Ga?
516. What is the period of Ga?
517. What is the group of In?
518. What is the period of In?
519. What is the block of Ga?
520. What is the block of In?
521. What is the electron configuration of Sr?
[Kr] 5sĀ².
522. What is the electron configuration of Ba?
[Xe] 6sĀ².
523. How many valence electrons in Sr?
524. How many valence electrons in Ba?
525. What is the electronegativity of Sr?
526. What is the electronegativity of Ba?
527. What is the ionization energy of Sr?
528. What is the ionization energy of Ba?
503 kJ/mol.
529. What is the atomic radius of Sr?
530. What is the atomic radius of Ba?
222 pm.
531. What is the group of Sr?
532. What is the period of Sr?
533. What is the group of Ba?
534. What is the period of Ba?
535. What is the block of Sr?
536. What is the block of Ba?
537. What is the electron configuration of I?
[Kr] 4dĀ¹ā° 5sĀ² 5pāµ.
538. What is the electron configuration of At?
[Xe] 4fĀ¹ā“ 5dĀ¹ā° 6sĀ² 6pāµ.
539. How many valence electrons in I?
540. How many valence electrons in At?
541. What is the electronegativity of I?
542. What is the electronegativity of At?
543. What is the ionization energy of I?
1008 kJ/mol.
544. What is the ionization energy of At?
926 kJ/mol.
545. What is the atomic radius of I?
133 pm.
546. What is the atomic radius of At?
547. What is the group of I?
548. What is the period of I?
549. What is the group of At?
550. What is the period of At?
551. What is the block of I?
552. What is the block of At?
553. What is the electron configuration of Tl?
[Xe] 4fĀ¹ā“ 5dĀ¹ā° 6sĀ² 6pĀ¹.
554. What is the electron configuration of Pb?
[Xe] 4fĀ¹ā“ 5dĀ¹ā° 6sĀ² 6pĀ².
555. How many valence electrons in Tl?
556. How many valence electrons in Pb?
557. What is the electronegativity of Tl?
558. What is the electronegativity of Pb?
559. What is the ionization energy of Tl?
560. What is the ionization energy of Pb?
716 kJ/mol.
561. What is the atomic radius of Tl?
562. What is the atomic radius of Pb?
175 pm.
563. What is the group of Tl?
564. What is the period of Tl?
565. What is the group of Pb?
566. What is the period of Pb?
567. What is the block of Tl?
568. What is the block of Pb?
569. What is the electron configuration of Fr?
[Rn] 7sĀ¹.
570. What is the electron configuration of Ra?
[Rn] 7sĀ².
571. How many valence electrons in Fr?
572. How many valence electrons in Ra?
573. What is the electronegativity of Fr?
574. What is the electronegativity of Ra?
575. What is the ionization energy of Fr?
576. What is the ionization energy of Ra?
577. What is the atomic radius of Fr?
578. What is the atomic radius of Ra?
579. What is the group of Fr?
580. What is the period of Fr?
581. What is the group of Ra?
582. What is the period of Ra?
583. What is the block of Fr?
584. What is the block of Ra?
585. What is the electron configuration of Ac?
[Rn] 6dĀ¹ 7sĀ².
586. What is the electron configuration of Th?
[Rn] 6dĀ² 7sĀ².
587. How many valence electrons in Ac?
588. How many valence electrons in Th?
589. What is the electronegativity of Ac?
590. What is the electronegativity of Th?
591. What is the ionization energy of Ac?
592. What is the ionization energy of Th?
587 kJ/mol.
593. What is the atomic radius of Ac?
195 pm.
594. What is the atomic radius of Th?
180 pm.
595. What is the group of Ac?
596. What is the period of Ac?
597. What is the group of Th?
598. What is the period of Th?
599. What is the block of Ac?
600. What is the block of Th?
601. What is the electron configuration of Ce?
602. What is the electron configuration of Lu?
[Xe] 4fĀ¹ā“ 5dĀ¹ 6sĀ².
603. How many valence electrons in Ce?
604. How many valence electrons in Lu?
605. What is the electronegativity of Ce?
606. What is the electronegativity of Lu?
607. What is the ionization energy of Ce?
534 kJ/mol.
608. What is the ionization energy of Lu?
524 kJ/mol.
609. What is the atomic radius of Ce?
185 pm.
610. What is the atomic radius of Lu?
173 pm.
611. What is the group of Ce?
612. What is the period of Ce?
613. What is the group of Lu?
614. What is the period of Lu?
615. What is the block of Ce?
616. What is the block of Lu?
617. What is the significance of periodic table?
Organizes elements systematically.
618. What is the significance of atomic radius?
Determines element size.
619. What is the significance of ionization energy?
Indicates electron stability.
620. What is the significance of electronegativity?
Predicts bond nature.
621. What is the significance of electron gain enthalpy?
Shows electron affinity.
622. What is the significance of valence?
Determines chemical reactivity.
623. What is the significance of metallic character?
Influences conductivity.
624. What is the significance of non-metallic character?
Affects bonding type.
625. What is the significance of diagonal relationship?
Explains similar properties.
626. What is the significance of periodicity?
Predicts element behavior.
627. What is the significance of s-block?
Highly reactive metals.
628. What is the significance of p-block?
Diverse properties.
629. What is the significance of d-block?
Transition metals.
630. What is the significance of f-block?
Rare earth elements.
631. What is the significance of groups?
Similar chemical properties.
632. What is the significance of periods?
Increasing atomic number.
633. What is the electron configuration of Ge?
[Ar] 3dĀ¹ā° 4sĀ² 4pĀ².
634. What is the electron configuration of Sn?
[Kr] 4dĀ¹ā° 5sĀ² 5pĀ².
635. How many valence electrons in Ge?
636. How many valence electrons in Sn?
637. What is the electronegativity of Ge?
638. What is the electronegativity of Sn?
639. What is the ionization energy of Ge?
762 kJ/mol.
640. What is the ionization energy of Sn?
709 kJ/mol.
641. What is the atomic radius of Ge?
122 pm.
642. What is the atomic radius of Sn?
643. What is the group of Ge?
644. What is the period of Ge?
645. What is the group of Sn?
646. What is the period of Sn?
647. What is the block of Ge?
648. What is the block of Sn?
649. What is the electron configuration of As?
[Ar] 3dĀ¹ā° 4sĀ² 4pĀ³.
650. What is the electron configuration of Sb?
[Kr] 4dĀ¹ā° 5sĀ² 5pĀ³.
651. How many valence electrons in As?
652. How many valence electrons in Sb?
653. What is the electronegativity of As?
654. What is the electronegativity of Sb?
655. What is the ionization energy of As?
947 kJ/mol.
656. What is the ionization energy of Sb?
834 kJ/mol.
657. What is the atomic radius of As?
119 pm.
658. What is the atomic radius of Sb?
141 pm.
659. What is the group of As?
660. What is the period of As?
661. What is the group of Sb?
662. What is the period of Sb?
663. What is the block of As?
664. What is the block of Sb?
665. What is the electron configuration of Se?
[Ar] 3dĀ¹ā° 4sĀ² 4pā“.
666. What is the electron configuration of Te?
[Kr] 4dĀ¹ā° 5sĀ² 5pā“.
667. How many valence electrons in Se?
668. How many valence electrons in Te?
669. What is the electronegativity of Se?
2.4.
670. What is the electronegativity of Te?
671. What is the ionization energy of Se?
941 kJ/mol.
672. What is the ionization energy of Te?
869 kJ/mol.
673. What is the atomic radius of Se?
115 pm.
674. What is the atomic radius of Te?
675. What is the group of Se?
676. What is the period of Se?
677. What is the group of Te?
678. What is the period of Te?
679. What is the block of Se?
680. What is the block of Te?
681. What is the electron configuration of Po?
[Xe] 4fĀ¹ā“ 5dĀ¹ā° 6sĀ² 6pā“.
682. What is the electron configuration of Bi?
[Xe] 4fĀ¹ā“ 5dĀ¹ā° 6sĀ² 6pĀ³.
683. How many valence electrons in Po?
684. How many valence electrons in Bi?
685. What is the electronegativity of Po?
686. What is the electronegativity of Bi?
687. What is the ionization energy of Po?
812 kJ/mol.
688. What is the ionization energy of Bi?
703 kJ/mol.
689. What is the atomic radius of Po?
168 pm.
690. What is the atomic radius of Bi?
155 pm.
691. What is the group of Po?
692. What is the period of Po?
693. What is the group of Bi?
694. What is the period of Bi?
695. What is the block of Po?
696. What is the block of Bi?
697. What is the atomic number of Ge?
32.
698. What is the atomic number of As?
33.
699. What is the atomic number of Se?
34.
700. What is the atomic number of Sn?
50.
701. What is the atomic number of Sb?
51.
702. What is the atomic number of Te?
52.
703. What is the atomic number of Bi?
83.
704. What is the atomic number of Po?
84.
705. What is the valence of Ge?
706. What is the valence of As?
707. What is the valence of Se?
708. What is the valence of Sn?
2 or 4.
709. What is the valence of Sb?
710. What is the valence of Te?
711. What is the valence of Bi?
712. What is the valence of Po?
713. What is the electron gain enthalpy of Se?
-195 kJ/mol.
714. What is the electron gain enthalpy of Te?
-190 kJ/mol.
715. Is Ge a metal or non-metal?
716. Is As a metal or non-metal?
717. Is Sb a metal or non-metal?
718. Is Te a metal or non-metal?
719. Is Bi a metal or non-metal?
Metal.
720. Is Po a metal or non-metal?
721. What is the metallic character of Ge?
Moderate.
722. What is the metallic character of As?
723. What is the metallic character of Bi?
724. What is the non-metallic character of Se?
725. What is the non-metallic character of Te?
726. What is the diagonal relationship between C and P?
727. What is the diagonal relationship between N and S?
728. What is the ionic radius of Fā»?
729. What is the ionic radius of Brā»?
196 pm.
730. What is the ionic radius of Iā»?
220 pm.
731. What is the ionic radius of Liāŗ?
76 pm.
732. What is the ionic radius of Kāŗ?
138 pm.
733. What is the ionic radius of Csāŗ?
734. What is the ionic radius of BeĀ²āŗ?
45 pm.
735. What is the ionic radius of CaĀ²āŗ?
100 pm.
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