Question
The correct ground state electronic configuration of chromium atom is :
A.
$$\left[ {Ar} \right]3{d^5}4{s^1}$$
B.
$$\left[ {Ar} \right]3{d^4}4{s^2}$$
C.
$$\left[ {Ar} \right]3{d^6}4{s^0}$$
D.
$$\left[ {Ar} \right]4{d^5}4{s^1}$$
Answer :
$$\left[ {Ar} \right]3{d^5}4{s^1}$$
Solution :
NOTE : Exactly half filled orbitals are more stable than nearly half filled orbitals.
$$Cr\left( {At.\,\,no.\,\,24} \right)$$ has configuration $$\left[ {Ar} \right]3{d^5},4{s^1}.$$