The correct ground state electronic configuration of chromium atom is :

Options

A. `[Ar]3d^(5)4s^(1)`
B. `[Ar]3d^(4)4s^(2)`
C. `[Ar]3d^(6)4s^(0)`
D. `[Ar]4d^(5)4s^(1)`

Answer

A

Explanation

`Cr(24)=ubrace(1s^(2)2s^(2)2p^(6)3s^(2)3p^(6))3d^(5)4s^(1)`, The above configuration is exception to Aufbau’s principle.