1. What is an atom?
Smallest unit of element.
2. Who proposed the plum pudding model?
J.J. Thomson.
3. What is the plum pudding model?
Atom as positive mass with embedded electrons.
4. What are cathode rays?
Stream of electrons.
5. Who discovered the electron?
6. What is the charge of an electron?
-1.602 x 10^-19 C.
7. What is the mass of an electron?
9.109 x 10^-31 kg.
8. What is e/m ratio?
Charge to mass ratio.
9. What is the e/m value for electron?
1.758 x 10^11 C/kg.
10. Who discovered the proton?
Ernest Rutherford.
11. What is the charge of a proton?
+1.602 x 10^-19 C.
12. What is the mass of a proton?
1.673 x 10^-27 kg.
13. Who discovered the neutron?
James Chadwick.
14. What is the mass of a neutron?
1.675 x 10^-27 kg.
15. What is the charge of a neutron?
Zero.
16. What is Rutherfordâs model?
Nucleus with orbiting electrons.
17. What is the nucleus?
Dense, positive core of atom.
18. What was alpha particle scattering?
Gold foil experiment.
19. What did Rutherford conclude?
Atom mostly empty, dense nucleus.
20. What is a limitation of Rutherfordâs model?
Couldnât explain electron stability.
21. Who proposed the planetary model?
Niels Bohr.
22. What is Bohrâs model?
Electrons in fixed orbits.
23. What is an orbit?
Fixed electron path.
24. What is the energy of Bohrâs orbit?
Quantized energy levels.
25. What is the formula for Bohrâs radius?
aâ
26. What is the radius of first orbit?
0.529 Ă .
27. What is the energy of electron in nth orbit?
Eâ
28. What is the energy of H-atom in ground state?
-13.6 eV.
29. What is ionization energy?
Energy to remove electron.
30. What is the ionization energy of H?
13.6 eV.
31. What is a limitation of Bohrâs model?
Works only for H-like atoms.
32. What is an atomic number?
Number of protons.
33. What is mass number?
Protons plus neutrons.
34. What is an isotope?
Same protons, different neutrons.
35. What is an example of isotope?
C-12, C-14.
36. What is an isobar?
Same mass number, different protons.
37. What is an example of isobar?
C-14, N-14.
38. What is electromagnetic radiation?
Energy as waves or particles.
39. What is wavelength?
Distance between wave crests.
40. What is frequency?
Cycles per second.
41. What is the speed of light?
3 x 10^8 m/s.
42. What is the relation between frequency and wavelength?
c
43. What is a photon?
Quantum of light.
44. What is the energy of a photon?
E
45. What is Planckâs constant?
6.626 x 10^-34 Js.
46. Who proposed quantum theory?
Max Planck.
47. What is black body radiation?
Energy emitted by heated object.
48. What is the photoelectric effect?
Electrons ejected by light.
49. Who explained photoelectric effect?
Albert Einstein.
50. What is threshold frequency?
Minimum frequency for ejection.
51. What is work function?
Energy to eject electron.
52. What is the photoelectric equation?
hν
53. What is spectrum?
Range of electromagnetic waves.
54. What is a continuous spectrum?
All wavelengths present.
55. What is an emission spectrum?
Light emitted by atoms.
56. What is an absorption spectrum?
Light absorbed by atoms.
57. What is line spectrum?
Discrete lines of light.
58. What is hydrogenâs line spectrum?
Series of colored lines.
59. What is the Balmer series?
Visible lines of H-spectrum.
60. What is the Lyman series?
UV lines of H-spectrum.
61. What is the Rydberg formula?
1/Îť
62. What is Rydberg constant?
1.097 x 10^7 m^-1.
63. What is the wave-particle duality?
Matter shows wave and particle nature.
64. Who proposed wave nature of electron?
Louis de Broglie.
65. What is de Broglie wavelength?
Îť
66. What is momentum?
Mass times velocity.
67. What is Heisenbergâs uncertainty principle?
Cannot know position and momentum exactly.
68. What is the uncertainty formula?
Îx ¡ Îp ⼠h/4Ď.
69. Who proposed uncertainty principle?
Werner Heisenberg.
70. What is quantum mechanics?
Study of atomic behavior.
71. What is SchrĂśdingerâs equation?
Describes electron wavefunction.
72. What is a wavefunction?
Mathematical description of electron.
73. What is an orbital?
Region of electron probability.
74. What is the quantum mechanical model?
Describes electrons as waves.
75. What is a quantum number?
Describes electron properties.
76. What is the principal quantum number?
n, energy level.
77. What is the azimuthal quantum number?
l, subshell shape.
78. What is the magnetic quantum number?
mâ, orbital orientation.
79. What is the spin quantum number?
mâ, electron spin.
80. What are the values of n?
1, 2, 3, ...
81. What are the values of l?
0 to (n-1).
82. What are the values of mâ?
-l to +l.
83. What are the values of mâ?
+1/2 or -1/2.
84. What is the s subshell?
l
85. What is the p subshell?
86. What is the d subshell?
87. What is the f subshell?
88. How many orbitals in s subshell?
1 orbital.
89. How many orbitals in p subshell?
3 orbitals.
90. How many orbitals in d subshell?
5 orbitals.
91. How many orbitals in f subshell?
7 orbitals.
92. What is the Pauli exclusion principle?
No two electrons same quantum numbers.
93. What is Aufbau principle?
Electrons fill lowest energy first.
94. What is Hundâs rule?
Maximize unpaired electrons.
95. What is electronic configuration?
Arrangement of electrons.
96. What is the configuration of H?
1sš.
97. What is the configuration of He?
1s².
98. What is the configuration of Li?
1s² 2sš.
99. What is the configuration of Be?
1s² 2s².
100. What is the configuration of B?
1s² 2s² 2pš.
101. What is the configuration of C?
1s² 2s² 2p².
102. What is the configuration of N?
1s² 2s² 2p³.
103. What is the configuration of O?
1s² 2s² 2pâ´.
104. What is the configuration of F?
1s² 2s² 2pâľ.
105. What is the configuration of Ne?
1s² 2s² 2pâś.
106. What is the configuration of Na?
1s² 2s² 2p✠3sš.
107. What is the configuration of Mg?
1s² 2s² 2p✠3s².
108. What is the configuration of Al?
1s² 2s² 2p✠3s² 3pš.
109. What is the configuration of Si?
1s² 2s² 2p✠3s² 3p².
110. What is the configuration of P?
1s² 2s² 2p✠3s² 3p³.
111. What is the configuration of S?
1s² 2s² 2pâś 3s² 3pâ´.
112. What is the configuration of Cl?
1s² 2s² 2pâś 3s² 3pâľ.
113. What is the configuration of Ar?
1s² 2s² 2pâś 3s² 3pâś.
114. What is the configuration of K?
1s² 2s² 2p✠3s² 3p✠4sš.
115. What is the configuration of Ca?
1s² 2s² 2p✠3s² 3p✠4s².
116. What is half-filled stability?
Subshells like pÂł stable.
117. What is fully-filled stability?
Subshells like pâś stable.
118. What is the configuration of Cr?
[Ar] 3d⾠4sš.
119. Why is Crâs configuration different?
Half-filled 3d stability.
120. What is the configuration of Cu?
[Ar] 3dšⰠ4sš.
121. Why is Cuâs configuration different?
Fully-filled 3d stability.
122. What is ground state?
Lowest energy configuration.
123. What is excited state?
Electron in higher orbital.
124. What is valence electron?
Outermost shell electron.
125. What is core electron?
Inner shell electron.
126. How many valence electrons in Na?
1.
127. How many valence electrons in O?
6.
128. What is the atomic number of H?
129. What is the atomic number of He?
2.
130. What is the atomic number of Li?
3.
131. What is the atomic number of Be?
4.
132. What is the atomic number of B?
5.
133. What is the atomic number of C?
134. What is the atomic number of N?
7.
135. What is the atomic number of O?
8.
136. What is the atomic number of F?
9.
137. What is the atomic number of Ne?
10.
138. What is the mass number of C-12?
12.
139. What is the mass number of C-14?
14.
140. How many protons in Na?
11.
141. How many neutrons in Na-23?
142. How many electrons in neutral Na?
143. What is an ion?
Charged atom.
144. What is a cation?
Positive ion.
145. What is an anion?
Negative ion.
146. How many electrons in Naâş?
147. How many electrons in Clâť?
18.
148. What is the configuration of Naâş?
149. What is the configuration of Clâť?
150. What is the Bohr radius for n
2.116 Ă .
151. What is the energy for n
-3.4 eV.
152. What is the shape of s orbital?
Spherical.
153. What is the shape of p orbital?
Dumbbell.
154. How many electrons in s orbital?
2 electrons.
155. How many electrons in p subshell?
6 electrons.
156. How many electrons in d subshell?
10 electrons.
157. How many electrons in f subshell?
14 electrons.
158. What is the maximum electrons in n
159. What is the maximum electrons in n
8 electrons.
160. What is the maximum electrons in n
18 electrons.
161. What is the maximum electrons in n
32 electrons.
162. What is the formula for max electrons?
2n².
163. What is the configuration of Sc?
[Ar] 3dš 4s².
164. What is the configuration of Ti?
[Ar] 3d² 4s².
165. What is the configuration of V?
[Ar] 3d³ 4s².
166. What is the configuration of Mn?
[Ar] 3d⾠4s².
167. What is the configuration of Fe?
[Ar] 3d✠4s².
168. What is the configuration of Co?
[Ar] 3d⡠4s².
169. What is the configuration of Ni?
[Ar] 3d⸠4s².
170. What is the configuration of Zn?
[Ar] 3dšⰠ4s².
171. What is the atomic number of Sc?
21.
172. What is the atomic number of Zn?
30.
173. What is the de Broglie wavelength of electron?
174. What is the significance of wavefunction?
Gives electron probability.
175. What is Ď²?
Probability density.
176. What is a node?
Region of zero probability.
177. How many nodes in 1s orbital?
0 nodes.
178. How many nodes in 2s orbital?
1 node.
179. How many nodes in 2p orbital?
180. What is radial node?
Spherical node.
181. What is angular node?
Planar node.
182. How many radial nodes?
n - l - 1.
183. How many angular nodes?
l.
184. What is total nodes?
n - 1.
185. What is the energy difference between n
10.2 eV.
186. What is the wavelength of Lyman series?
UV region.
187. What is the wavelength of Balmer series?
Visible region.
188. What is the Paschen series?
Infrared lines of H-spectrum.
189. What is the configuration of Kâş?
190. What is the configuration of Ca²�
191. How many valence electrons in Mg?
192. How many valence electrons in Cl?
193. What is the atomic number of Mg?
194. What is the atomic number of Cl?
17.
195. What is the mass number of Cl-35?
35.
196. What is the mass number of Cl-37?
37.
197. How many protons in Cl?
198. How many neutrons in Cl-35?
199. What is the configuration of Br?
[Ar] 3dšⰠ4s² 4pâľ.
200. What is the configuration of Kr?
[Ar] 3dšⰠ4s² 4pâś.
201. What is the atomic number of Br?
202. What is the atomic number of Kr?
36.
203. How many valence electrons in Br?
204. How many valence electrons in Kr?
205. What is the configuration of Fe²�
[Ar] 3dâś.
206. What is the configuration of Cu²�
[Ar] 3dâš.
207. What is degeneracy?
Orbitals with same energy.
208. What is the energy of n
-1.51 eV.
209. What is the radius for n
4.761 Ă .
210. What is the shape of d orbital?
Double dumbbell.
211. How many orbitals in n
212. How many orbitals in n
4 orbitals.
213. How many orbitals in n
9 orbitals.
214. What is the formula for orbitals?
n².
215. What is the configuration of Ag?
[Kr] 4dšⰠ5sš.
216. What is the configuration of Au?
[Xe] 4fšⴠ5dšⰠ6sš.
217. What is the atomic number of Ag?
47.
218. What is the atomic number of Au?
79.
219. What is the Compton effect?
Scattering of photons by electrons.
220. What is pair production?
Photon forms electron-positron pair.
221. What is a positron?
Positive electron.
222. What is the charge of positron?
223. What is annihilation?
Electron-positron form photons.
224. What is the configuration of NÂłâť?
225. What is the configuration of O²�
226. How many electrons in NÂłâť?
227. How many electrons in O²�
228. What is isoelectronic?
Same number of electrons.
229. What is an example of isoelectronic?
NÂłâť, O²âť, Ne.
230. What is the atomic number of Fe?
26.
231. What is the atomic number of Cu?
29.
232. What is the mass number of Fe-56?
56.
233. How many neutrons in Fe-56?
234. What is the configuration of Rb?
[Kr] 5sš.
235. What is the configuration of Sr?
[Kr] 5s².
236. What is the atomic number of Rb?
237. What is the atomic number of Sr?
38.
238. How many valence electrons in Rb?
239. How many valence electrons in Sr?
240. What is the configuration of I?
[Kr] 4dšⰠ5s² 5pâľ.
241. What is the configuration of Xe?
[Kr] 4dšⰠ5s² 5pâś.
242. What is the atomic number of I?
53.
243. What is the atomic number of Xe?
54.
244. How many valence electrons in I?
245. How many valence electrons in Xe?
246. What is the energy of n
-0.85 eV.
247. What is the radius for n
8.464 Ă .
248. What is the Brackett series?
Infrared lines, nâ
249. What is the Pfund series?
250. What is the maximum wavelength of Lyman?
121.6 nm.
251. What is the minimum wavelength of Balmer?
364.6 nm.
252. What is the configuration of Cs?
[Xe] 6sš.
253. What is the configuration of Ba?
[Xe] 6s².
254. What is the atomic number of Cs?
55.
255. What is the atomic number of Ba?
256. How many valence electrons in Cs?
257. How many valence electrons in Ba?
258. What is the configuration of Hg?
[Xe] 4fšⴠ5dšⰠ6s².
259. What is the atomic number of Hg?
80.
260. How many valence electrons in Hg?
261. What is the configuration of Pb?
[Xe] 4fšⴠ5dšⰠ6s² 6p².
262. What is the atomic number of Pb?
82.
263. How many valence electrons in Pb?
264. What is the configuration of Bi?
[Xe] 4fšⴠ5dšⰠ6s² 6p³.
265. What is the atomic number of Bi?
83.
266. How many valence electrons in Bi?
267. What is the configuration of Rn?
[Xe] 4fšⴠ5dšⰠ6s² 6pâś.
268. What is the atomic number of Rn?
86.
269. How many valence electrons in Rn?
270. What is the configuration of Fr?
[Rn] 7sš.
271. What is the atomic number of Fr?
87.
272. How many valence electrons in Fr?
273. What is the configuration of Ra?
[Rn] 7s².
274. What is the atomic number of Ra?
88.
275. How many valence electrons in Ra?
276. What is the configuration of U?
[Rn] 5f³ 6dš 7s².
277. What is the atomic number of U?
92.
278. How many valence electrons in U?
279. What is the significance of quantum numbers?
Define electronâs state.
280. What is the shape of f orbital?
Complex, multiple lobes.
281. How many nodes in 3s orbital?
2 nodes.
282. How many nodes in 3p orbital?
283. How many nodes in 3d orbital?
284. How many radial nodes in 2s?
285. How many radial nodes in 2p?
0.
286. How many angular nodes in p orbital?
287. How many angular nodes in d orbital?
288. What is the configuration of Mo?
[Kr] 4d⾠5sš.
289. What is the configuration of Pd?
[Kr] 4dšâ°.
290. What is the atomic number of Mo?
42.
291. What is the atomic number of Pd?
46.
292. Why is Pdâs configuration unique?
Fully-filled 4d subshell.
293. What is the configuration of Nb?
[Kr] 4dⴠ5sš.
294. What is the atomic number of Nb?
41.
295. What is the configuration of Tc?
[Kr] 4d⾠5s².
296. What is the atomic number of Tc?
43.
297. What is the configuration of Ru?
[Kr] 4d⡠5sš.
298. What is the atomic number of Ru?
44.
299. What is the configuration of Rh?
[Kr] 4d⸠5sš.
300. What is the atomic number of Rh?
45.
301. What is the configuration of Cd?
[Kr] 4dšⰠ5s².
302. What is the atomic number of Cd?
48.
303. What is the configuration of In?
[Kr] 4dšⰠ5s² 5pš.
304. What is the atomic number of In?
49.
305. What is the configuration of Sn?
[Kr] 4dšⰠ5s² 5p².
306. What is the atomic number of Sn?
50.
307. What is the configuration of Sb?
[Kr] 4dšⰠ5s² 5p³.
308. What is the atomic number of Sb?
51.
309. What is the configuration of Te?
[Kr] 4dšⰠ5s² 5pâ´.
310. What is the atomic number of Te?
52.
311. How many valence electrons in Sn?
312. How many valence electrons in Sb?
313. How many valence electrons in Te?
314. What is the configuration of La?
[Xe] 5dš 6s².
315. What is the atomic number of La?
57.
316. What is the configuration of Ce?
[Xe] 4fš 5dš 6s².
317. What is the atomic number of Ce?
58.
318. What is the configuration of Pr?
[Xe] 4f³ 6s².
319. What is the atomic number of Pr?
59.
320. What is the configuration of Nd?
[Xe] 4fⴠ6s².
321. What is the atomic number of Nd?
60.
322. What is the configuration of Gd?
[Xe] 4f⡠5dš 6s².
323. What is the atomic number of Gd?
64.
324. What is the configuration of Tb?
[Xe] 4649 6s².
325. What is the atomic number of Tb?
65.
326. What is the configuration of Dy?
[Xe] 4fšⰠ6s².
327. What is the atomic number of Dy?
66.
328. What is the configuration of Ho?
[Xe] 4fšš 6s².
329. What is the atomic number of Ho?
67.
330. What is the configuration of Er?
[Xe] 4fš² 6s².
331. What is the atomic number of Er?
68.
332. What is the configuration of Tm?
[Xe] 4fš³ 6s².
333. What is the atomic number of Tm?
69.
334. What is the configuration of Yb?
[Xe] 4fšⴠ6s².
335. What is the atomic number of Yb?
70.
336. What is the configuration of Lu?
[Xe] 4fšⴠ5dš 6s².
337. What is the atomic number of Lu?
71.
338. What are lanthanides?
Elements 58 to 71.
339. What is the configuration of Ac?
[Rn] 6dš 7s².
340. What is the atomic number of Ac?
89.
341. What is the configuration of Th?
[Rn] 6d² 7s².
342. What is the atomic number of Th?
90.
343. What is the configuration of Pa?
[Rn] 5f² 6dš 7s².
344. What is the atomic number of Pa?
91.
345. What are actinides?
Elements 90 to 103.
346. How many valence electrons in La?
347. How many valence electrons in Ce?
348. What is the configuration of Mg²�
349. What is the configuration of AlÂłâş?
350. How many electrons in Mg²�
351. How many electrons in AlÂłâş?
352. What is the configuration of S²�
353. How many electrons in S²�
354. What is the configuration of PÂłâť?
355. How many electrons in PÂłâť?
356. What is the configuration of Zn²�
[Ar] 3dšâ°.
357. How many electrons in Zn²�
28.
358. What is the configuration of Ni²�
[Ar] 3dâ¸.
359. How many electrons in Ni²�
360. What is the configuration of Co²�
[Ar] 3dâˇ.
361. How many electrons in Co²�
25.
362. What is the configuration of Mn²�
[Ar] 3dâľ.
363. How many electrons in Mn²�
23.
364. What is the configuration of V²�
[Ar] 3dÂł.
365. How many electrons in V²�
366. What is the configuration of Ti²�
[Ar] 3d².
367. How many electrons in Ti²�
20.
368. What is the configuration of ScÂłâş?
[Ar].
369. How many electrons in ScÂłâş?
370. What is the configuration of FeÂłâş?
371. How many electrons in FeÂłâş?
372. What is the configuration of CoÂłâş?
373. How many electrons in CoÂłâş?
24.
374. What is the configuration of NiÂłâş?
375. How many electrons in NiÂłâş?
376. What is the configuration of Cuâş?
377. How many electrons in Cuâş?
378. What is the configuration of Agâş?
379. How many electrons in Agâş?
380. What is the configuration of Auâş?
[Xe] 4fšⴠ5dšâ°.
381. How many electrons in Auâş?
78.
382. What is the configuration of Pb²�
383. How many electrons in Pb²�
384. What is the configuration of BiÂłâş?
385. How many electrons in BiÂłâş?
386. What is the configuration of Sn²�
387. How many electrons in Sn²�
388. What is the configuration of SbÂłâş?
389. How many electrons in SbÂłâş?
390. What is the configuration of InÂłâş?
391. How many electrons in InÂłâş?
392. What is the configuration of Cd²�
393. How many electrons in Cd²�
394. What is the configuration of Sr²�
[Kr].
395. How many electrons in Sr²�
396. What is the configuration of Rbâş?
397. How many electrons in Rbâş?
398. What is the configuration of Csâş?
[Xe].
399. How many electrons in Csâş?
400. What is the configuration of Ba²�
401. How many electrons in Ba²�
402. What is the configuration of Ra²�
[Rn].
403. How many electrons in Ra²�
404. What is the configuration of Frâş?
405. How many electrons in Frâş?
406. What is the configuration of Iâť?
407. How many electrons in Iâť?
408. What is the configuration of Te²�
409. How many electrons in Te²�
410. What is the configuration of Se²�
411. How many electrons in Se²�
412. What is the configuration of Brâť?
413. How many electrons in Brâť?
414. How many radial nodes in 3s?
415. How many radial nodes in 3p?
416. How many radial nodes in 3d?
417. How many angular nodes in s orbital?
418. How many angular nodes in f orbital?
419. How many total nodes in 4s?
420. How many total nodes in 4p?
421. How many total nodes in 4d?
422. How many total nodes in 4f?
423. What is the energy of n
-0.544 eV.
424. What is the radius for n
13.225 Ă .
425. What is the configuration of Ga?
[Ar] 3dšⰠ4s² 4pš.
426. What is the atomic number of Ga?
31.
427. What is the configuration of Ge?
[Ar] 3dšⰠ4s² 4p².
428. What is the atomic number of Ge?
32.
429. What is the configuration of As?
[Ar] 3dšⰠ4s² 4p³.
430. What is the atomic number of As?
33.
431. What is the configuration of Se?
[Ar] 3dšⰠ4s² 4pâ´.
432. What is the atomic number of Se?
34.
433. How many valence electrons in Ga?
434. How many valence electrons in Ge?
435. How many valence electrons in As?
436. How many valence electrons in Se?
437. What is the configuration of Tl?
[Xe] 4fšⴠ5dšⰠ6s² 6pš.
438. What is the atomic number of Tl?
81.
439. What is the configuration of Po?
[Xe] 4fšⴠ5dšⰠ6s² 6pâ´.
440. What is the atomic number of Po?
84.
441. What is the configuration of At?
[Xe] 4fšⴠ5dšⰠ6s² 6pâľ.
442. What is the atomic number of At?
85.
443. How many valence electrons in Tl?
444. How many valence electrons in Po?
445. How many valence electrons in At?
446. What is the configuration of GaÂłâş?
447. How many electrons in GaÂłâş?
448. What is the configuration of Ge²�
449. How many electrons in Ge²�
450. What is the configuration of AsÂłâş?
451. How many electrons in AsÂłâş?
452. What is the configuration of Se²�
453. How many electrons in Se²�
454. What is the configuration of TlÂłâş?
455. How many electrons in TlÂłâş?
456. What is the configuration of Po²�
457. How many electrons in Po²�
458. What is the configuration of Atâť?
459. How many electrons in Atâť?
460. What is the configuration of Y?
[Kr] 4dš 5s².
461. What is the atomic number of Y?
39.
462. What is the configuration of Zr?
[Kr] 4d² 5s².
463. What is the atomic number of Zr?
40.
464. How many valence electrons in Y?
465. How many valence electrons in Zr?
466. What is the configuration of YÂłâş?
467. How many electrons in YÂłâş?
468. What is the configuration of Zrâ´âş?
469. How many electrons in Zrâ´âş?
470. What is the configuration of Eu?
[Xe] 4f⡠6s².
471. What is the atomic number of Eu?
63.
472. What is the configuration of Sm?
[Xe] 4f✠6s².
473. What is the atomic number of Sm?
62.
474. What is the configuration of Pm?
[Xe] 4f⾠6s².
475. What is the atomic number of Pm?
61.
476. How many valence electrons in Eu?
477. How many valence electrons in Sm?
478. What is the configuration of EuÂłâş?
[Xe] 4fâś.
479. How many electrons in EuÂłâş?
480. What is the configuration of SmÂłâş?
[Xe] 4fâľ.
481. How many electrons in SmÂłâş?
482. What is the configuration of Pt?
[Xe] 4fšⴠ5d⚠6sš.
483. What is the atomic number of Pt?
484. What is the configuration of Ir?
[Xe] 4fšⴠ5d⡠6s².
485. What is the atomic number of Ir?
77.
486. What is the configuration of Os?
[Xe] 4fšⴠ5d✠6s².
487. What is the atomic number of Os?
76.
488. How many valence electrons in Pt?
489. How many valence electrons in Ir?
490. How many valence electrons in Os?
491. What is the configuration of Pt²�
[Xe] 4fšⴠ5dâ¸.
492. How many electrons in Pt²�
493. What is the configuration of IrÂłâş?
[Xe] 4fšⴠ5dâś.
494. How many electrons in IrÂłâş?
74.
495. What is the configuration of Osâ´âş?
[Xe] 4fšⴠ5dâ´.
496. How many electrons in Osâ´âş?
72.
497. What is the configuration of Np?
[Rn] 5fⴠ6dš 7s².
498. What is the atomic number of Np?
93.
499. What is the configuration of Pu?
[Rn] 5f✠7s².
500. What is the atomic number of Pu?
94.
501. How many valence electrons in Np?
502. How many valence electrons in Pu?
503. What is the configuration of Am?
[Rn] 5f⡠7s².
504. What is the atomic number of Am?
95.
505. How many valence electrons in Am?
506. What is the configuration of Cm?
[Rn] 5f⡠6dš 7s².
507. What is the atomic number of Cm?
96.
508. How many valence electrons in Cm?
509. How many radial nodes in 4s?
510. How many radial nodes in 4p?
511. How many radial nodes in 4d?
512. How many radial nodes in 4f?
513. How many angular nodes in 4f?
514. How many total nodes in 5s?
515. How many total nodes in 5p?
516. How many total nodes in 5d?
517. How many total nodes in 5f?
518. What is the energy of n
-0.378 eV.
519. What is the radius for n
19.044 Ă .
520. What is the configuration of Bk?
[Rn] 5f⚠7s².
521. What is the atomic number of Bk?
97.
522. What is the configuration of Cf?
[Rn] 5fšⰠ7s².
523. What is the atomic number of Cf?
98.
524. What is the configuration of Es?
[Rn] 5fšš 7s².
525. What is the atomic number of Es?
99.
526. What is the configuration of Fm?
[Rn] 5fš² 7s².
527. What is the atomic number of Fm?
100.
528. How many valence electrons in Bk?
529. How many valence electrons in Cf?
530. How many valence electrons in Es?
531. How many valence electrons in Fm?
532. What is the configuration of Md?
[Rn] 5fš³ 7s².
533. What is the atomic number of Md?
101.
534. What is the configuration of No?
[Rn] 5fšⴠ7s².
535. What is the atomic number of No?
102.
536. What is the configuration of Lr?
[Rn] 5fšⴠ6dš 7s².
537. What is the atomic number of Lr?
103.
538. How many valence electrons in Md?
539. How many valence electrons in No?
540. How many valence electrons in Lr?
541. What is the configuration of Hg²�
542. How many electrons in Hg²�
543. What is the configuration of AuÂłâş?
544. How many electrons in AuÂłâş?
545. What is the configuration of Ptâ´âş?
546. How many electrons in Ptâ´âş?
547. What is the configuration of W?
[Xe] 4fšⴠ5dⴠ6s².
548. What is the atomic number of W?
549. What is the configuration of Re?
[Xe] 4fšⴠ5d⾠6s².
550. What is the atomic number of Re?
75.
551. How many valence electrons in W?
552. How many valence electrons in Re?
553. What is the configuration of Ta?
[Xe] 4fšⴠ5d³ 6s².
554. What is the atomic number of Ta?
73.
555. What is the configuration of Hf?
[Xe] 4fšⴠ5d² 6s².
556. What is the atomic number of Hf?
557. How many valence electrons in Ta?
558. How many valence electrons in Hf?
559. What is the configuration of Wâśâş?
[Xe] 4fšâ´.
560. How many electrons in Wâśâş?
561. What is the configuration of Reâľâş?
[Xe] 4fšⴠ5d².
562. How many electrons in Reâľâş?
563. What is the configuration of Taâľâş?
564. How many electrons in Taâľâş?
565. What is the configuration of Hfâ´âş?
566. How many electrons in Hfâ´âş?
567. How many radial nodes in 5s?
568. How many radial nodes in 5p?
569. How many radial nodes in 5d?
570. How many radial nodes in 5f?
571. How many angular nodes in 5f?
572. How many total nodes in 6s?
573. How many total nodes in 6p?
574. How many total nodes in 6d?
575. How many total nodes in 6f?
576. What is the energy of n
-0.278 eV.
577. What is the radius for n
25.921 Ă .
578. What is the configuration of Rf?
[Rn] 5fšⴠ6d² 7s².
579. What is the atomic number of Rf?
104.
580. What is the configuration of Db?
[Rn] 5fšⴠ6d³ 7s².
581. What is the atomic number of Db?
105.
582. What is the configuration of Sg?
[Rn] 5fšⴠ6dⴠ7s².
583. What is the atomic number of Sg?
106.
584. How many valence electrons in Rf?
585. How many valence electrons in Db?
586. How many valence electrons in Sg?
587. What is the configuration of Bh?
[Rn] 5fšⴠ6d⾠7s².
588. What is the atomic number of Bh?
107.
589. What is the configuration of Hs?
[Rn] 5fšⴠ6d✠7s².
590. What is the atomic number of Hs?
108.
591. What is the configuration of Mt?
[Rn] 5fšⴠ6d⡠7s².
592. What is the atomic number of Mt?
109.
593. How many valence electrons in Bh?
594. How many valence electrons in Hs?
595. How many valence electrons in Mt?
596. What is the configuration of Ds?
[Rn] 5fšⴠ6d⸠7s².
597. What is the atomic number of Ds?
110.
598. What is the configuration of Rg?
[Rn] 5fšⴠ6d⚠7s².
599. What is the atomic number of Rg?
111.
600. What is the configuration of Cn?
[Rn] 5fšⴠ6dšⰠ7s².
601. What is the atomic number of Cn?
112.
602. How many valence electrons in Ds?
603. How many valence electrons in Rg?
604. How many valence electrons in Cn?
605. What is the configuration of Nh?
[Rn] 5fšⴠ6dšⰠ7s² 7pš.
606. What is the atomic number of Nh?
113.
607. What is the configuration of Fl?
[Rn] 5fšⴠ6dšⰠ7s² 7p².
608. What is the atomic number of Fl?
114.
609. What is the configuration of Mc?
[Rn] 5fšⴠ6dšⰠ7s² 7p³.
610. What is the atomic number of Mc?
115.
611. How many valence electrons in Nh?
612. How many valence electrons in Fl?
613. How many valence electrons in Mc?
614. What is the configuration of Lv?
[Rn] 5fšⴠ6dšⰠ7s² 7pâ´.
615. What is the atomic number of Lv?
116.
616. What is the configuration of Ts?
[Rn] 5fšⴠ6dšⰠ7s² 7pâľ.
617. What is the atomic number of Ts?
117.
618. What is the configuration of Og?
[Rn] 5fšⴠ6dšⰠ7s² 7pâś.
619. What is the atomic number of Og?
118.
620. How many valence electrons in Lv?
621. How many valence electrons in Ts?
622. How many valence electrons in Og?
623. What is the configuration of NhÂłâş?
[Rn] 5fšⴠ6dšâ°.
624. How many electrons in NhÂłâş?
625. What is the configuration of Fl²�
626. How many electrons in Fl²�
627. What is the configuration of McÂłâş?
628. How many electrons in McÂłâş?
629. What is the configuration of Lv²�
630. How many electrons in Lv²�
631. What is the configuration of Tsâť?
632. How many electrons in Tsâť?
633. What is the configuration of Og²�
[Rn] 5fšⴠ6dšⰠ7s² 7pâ¸.
634. How many electrons in Og²�
120.
635. How many radial nodes in 6s?
636. How many radial nodes in 6p?
637. How many radial nodes in 6d?
638. How many radial nodes in 6f?
639. How many angular nodes in 6f?
640. How many total nodes in 7s?
641. How many total nodes in 7p?
642. How many total nodes in 7d?
643. How many total nodes in 7f?
644. What is the energy of n
-0.213 eV.
645. What is the radius for n
33.856 Ă .
646. What is the energy of n
-0.168 eV.
647. What is the radius for n
42.849 Ă .
648. What is the energy of n
-0.136 eV.
649. What is the radius for n
52.9 Ă .
650. What is the significance of Hundâs rule?
Ensures maximum stability.
651. What is the significance of Pauli principle?
Unique electron identity.
652. What is the significance of Aufbau principle?
Orderly electron filling.
653. What is the significance of wave-particle duality?
Explains electron behavior.
654. What is the significance of uncertainty principle?
Limits precise measurements.
655. What is the significance of quantum mechanics?
Describes atomic structure.
656. What is the significance of Bohrâs model?
657. What is the significance of Rutherfordâs model?
Introduced nucleus.
658. What is the significance of Thomsonâs model?
Proposed electron existence.
659. What is the significance of line spectrum?
Unique atomic fingerprint.
660. What is the significance of orbitals?
Electron probability regions.
661. What is the significance of electronic configuration?
Determines chemical properties.
662. What is the significance of valence electrons?
Involved in bonding.
663. What is the significance of core electrons?
Shield valence electrons.
664. What is the significance of isotopes?
Different nuclear properties.
665. What is the significance of isobars?
Same mass, different elements.
666. What is the significance of isoelectronic species?
Similar electronic structure.
667. What is the significance of quantum numbers?
Specify electron state.
668. What is the significance of nodes?
Zero
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