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Chemistry Question on Structure of atom

The ground state electronic configuration of chromium is

A

[Ar]3d54s1[Ar] 3d^5 4s^1

B

[Ar]3d44s2[Ar] 3d^4 4s^2

C

[Ar]3d64s0[Ar] 3d^6 4s^0

D

[Ar]4d54s1[Ar] 4d^5 4s^1

Answer

[Ar]3d54s1[Ar] 3d^5 4s^1

Explanation

Solution

Cr(24)=1s2 2s2 2p6 3s2 3p6⏟Ar 3d5 4s1Cr (24) = \underbrace{1s^2 \, 2s^2 \, 2p^6 \, 3s^2 \, 3p^6 }_{Ar} \, 3d^5 \, 4s^1 The above configuration is exception to Aufbau- principle.