Atomic Structure Question 317

Question: Which of the following electronic configuration is not possible according to Hund-s rule [Kerala PMT 2004]

Options:

A) $ 1s^{2}2s^{2} $

B) $ 1s^{2}2s^{1} $

C) $ 1s^{2}2s^{2}2p_x^{1}2p_y^{1}2p_x^{1} $

D) $ 1s^{2}2s^{2}2p_x^{2} $

E) $ 1s^{2}2s^{2}2p_x^{2}2p_y^{1}2p_z^{1} $

Show Answer

Answer:

Correct Answer: D

Solution:

According to Hund’s rule electron first fill in unpaired form in vacant orbital then fill in paired form to stabilized the molecule by which $ 1s^{2},2s^{2},2p_x^{2} $ is not possible. According to Hund’s rule. Because $ 2p_{x},p_{y},p_{z} $ have the same energy level so electron first fill in unpaired form not in paired form so it should be $ 1s^{2},,2s^{2},,2p_x^{1},2p_y^{1} $ .



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