Atomic Structure Question 241

Question: Which electronic configuration is not observing the ( $ n+l $ ) rule

Options:

A) $ 1s^{2},2s^{2}2p^{6},3s^{2}3p^{6}3d^{1},4s^{2} $

B) $ 1s^{2},2s^{2}sp^{6},3s^{2}3p^{6}3d^{7},4s^{2} $

C) $ 1s^{2},2s^{2}2p^{6},3s^{2}3p^{6}3d^{5},4s^{1} $

D) $ 1s^{2},2s^{2}2p^{6},3s^{2}3p^{6}3d^{8},4s^{2} $

Show Answer

Answer:

Correct Answer: C

Solution:

3d subshell filled with 5 electrons (half-filled) is more stable than that filled with 4 electrons. $ 1,,4s $ electrons jumps into $ 3d $ subshell for more sability.



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