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The correct ground state electronic configuration of chromium atom (At. No = 24) is 

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The correct ground state electronic configuration of chromium atom (At. No = 24) is 

(a) [Ar] 3d5 4s1

(b) [Ar] 3d4 4s2

(c) [Ar] 3d6 4s0

(d) [Ar] 4d5 4s1

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Correct option is (a) [Ar] 3d5 4s1

3d subshell filled with 5 electrons (half-filled) is more stable than that with 4 electrons.

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