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.
