Question

*Electron configuration*

**The magnetic behavior of an atom or ion depends on
its electron configuration.**

**Part A**

**Select the correct electron configurations from the list
below. You can refer to the periodic table for atomic
numbers.**

**Check all that apply.**

A) The electron configuration of Rb is [Kr]5s^04d^1.

B) The electron configuration of C is [He]2s^22p^2.

C) The electron configuration of S2− is [Ne]3s^23p^6.

D) The electron configuration of Fe is [Ar]4s^23d^6.

E) The electron configuration of Au+ is [Xe]4f^145d^96s^1.

Answer #1

Ans - A) for Rb electron configration is [Kr] 5s^{1}
(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{2}4p^{6}5s^{1})

B) for C electron configration is [He]
2s^{2}2p^{2} (
1s^{2}2s^{2}2p^{2})

C) for S-2 electron configration is [Ne] 3s^{2}
3p^{6} (1s^{2} 2s^{2} 2p^{6}
3s^{2} 3p^{6})

D) for Fe electron configration is [Ar]
3d^{6}4s^{2}
(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{6}4s^{2})

E) foe Au^{+} electron configration is Xe]
6s^{2} 4f^{14}5d^{8}

so According to the above correct configration only option B, C and D matches to the given configration, hence only B, C and D are correct

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