Atomic Structure Question 323
Question: Which of the following electronic configuration is not possible [MHCET 2003]
Options:
A) $ 1s^{2}2s^{2} $
B) $ 1s^{2},2s^{2}2p^{6} $
C) $ [Ar],3d^{10},4s^{2}4p^{2} $
D) $ 1s^{2},2s^{2}2p^{2},3s^{1} $
Show Answer
Answer:
Correct Answer: D
Solution:
We know from the Aufbau principle, that 2p orbital will be filled before 3s orbital. Therefore, the electronic configuration $ 1s^{2},,2s^{2},,2p^{2},,3s^{1} $ is not possible.
