The correct ground state electronic configuration of chromium atom(Z=24) 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

3d subshell filled with 5 electrons (half-filled) is more stable than that filled with 4 electrons. 1,4s electron jump into 3d subshell for more stability