Atomic Structure - Result Question 58

####34. The correct ground state electronic configuration of chromium atom is

(a) [Ar]3d54s1

(b) [Ar]3d44s2

(c) [Ar]3d64s0

(d) [Ar]4d54s1

(1989,1M)

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Answer:

Correct Answer: 34. (a)

Solution:

  1. Cr(24)=1s22s22p63s23p6Ar3d54s1

The above configuration is exception to Aufbau’s principle.



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