Correct ground state electronic configuration chromium atom, Chemistry

The correct ground state electronic configuration of chromium atom is:

(1) [Ar] 3d5 4s1               

(2)[Ar]3d4 4s2    

(3) [AR]3d6 4s0               

(4)[Ar]4d5 4s1

Ans:   [Ar] 3d5 4s1

 

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