If the electronic configuration of an element is `1s^(2)2s^(2)2p^(2)3s^(2)3p^(6)3d^(2)4s^(2)`, four electrons involved in chemical bond formation will be ……… .

Options

A. `3p^(6)`
B. `3p^(6),4s^(2)`
C. `3p^(6),3d^(2)`
D. `3d^(2),4s^(2)`

Answer

D

Explanation

`ns^(2)` and (n-1) d electrons (n=4) are involved in the bond formatin.