Question

CHEMISTRY 171: PROBLEM SET #1 (9/27/19) DUE: Friday, October 4, 2019 Give the valence shell configuration for: a) Kr. Xe and Rn; b) Br. I and At; c) Se?, Te? Po?:) Mna: e) FI (Flerovium), f) Gd 1. 2. The following are several electronic configurations that may be correct for the nitrogen atom (Z - 7). Arrows represent electrons whose direction indicates the value of the spin quantum numbers. The three circles for the p orbitals indicate the possible values of the orbital-orientation quantum number ml. For each configuration write one of the following words: "excited" if the configuration represents a possible excited state of the nitrogen atom; "ground" if the configuration represents the ground state of the nitrogen atom; or "forbidden" if the configuration in question cannot exist. (Ignore selection rules) "O 0 000 O "O O 000 o •© © *000000 0000QQI 000008 3. Write the orbital electronic structures for the following atoms and ions and, where appropriate, show that you know Hund's rule: P (Z - 15): Na (2-11): As (Z - 33). C'(Z = 6): O' (Z - 8). 4. Determine the number of unpaired electrons in the following atoms: Po (Z - 84); O (Z-8); P (Z = 15), S (Z -16) 5. Draw spatial representations for the following orbitals and put in X, Y. and Z coordinates: a) 2p2 b)5d c) 3d. d)3dy e ) n = 4.1= 1. f) n=15, 1-0 6. An electron is in one of the 4d orbitals. What are the possible values of the orbital quantum numbers n, 7 and m/ for the electron? 7. Write the orbital electronic structure of the ground state of (a) the bismuth atom (Z = 83), and (b) the W (Z = 74). ion 8. Why do the 4s, 4p, 4d and 4f orbitals have the same energy in the hydrogen atom, but different energies in many-electron atoms? BONUS: Suppose that you discovered some material from another universe that obeyed the following restrictions on quantum numbers: n>0 1+1<n M +1 or -1 m = +1/2 Assume that Hund's rule still applies. What would be the atomic numbers of the first three noble gases in that universe? What would be the atomic numbers of the first three halogens?

Answer 1

a) elec sonic confe of noble gas kr, xe, Rn. Ko = Atomic No=36 15 2² 2p 3s 3p us 3d upo of [Ar]3d us² upon Xe - Atomic No = 544 = 13 28 2 po 3 zp'us 3d" up 5s 4 do spo of [ko] 4 do 55 5po RM - At No =) 86 =) 15 28 29 33 3p 43 3d up oss ud spo 65 4 5 4 5 do 6 po or [kg] 4f" sdo 65² 6 po 6) Br- At no-35 = 18 25 2p 3s 3p us 3d ups or [Ar] 3 do uš 405 I = At No - 63 15 25 206 35 3p645 3 do upo 53 ud sps or [ko] 4 do 55² 595 AL- At No 85 = 15 25 28 35 3p 43 3d up 53² 4 do 5 po 4 3 4 4 4 5 do 6ps or [kr] Up" 5 do 63 605

Sear=) As se a have atomic No-34 ta é for ove charge so ĕ will some fos Te a =) some as Xe coz Te » 54+2ě = 56 Po² = same bas An As Po= 84 + 20 for a = 80 some bos Rn d) Mn 2+ Stomic no For Mn = Q7 But sê are removed so é 15² 25² 20 35 306 3 d uso - e) Fe [Flereviem) – is Carbon fomily member in oth Fl en s'as*2*3$ 30483 d'90" ss? udºsp6652 484 5 d' 6p6 7² 5 F" 6 do 70² of [Rn] 78 5f" 6 do 7p2 f) Grdatais f black member au Crd 3 1 15 23 3 3 3 po us 3d up & 4 do 5 pb u ssd porod 114
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