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} $ .
