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.



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