The number of electrons with `(n + l) ge 4` and `S = + (1)/(2)` in the atom of chromium is ground state.

Options

A. 5
B. 6
C. 9
D. 12

Answer

C

Explanation

`{:(Cr : 3s^(2),3p^(6),4s^(1),3d^(5),),(,darr,darr,darr,),((n + l) =,4,4,5,):}`
Thus `S = + (1)/(2)` is for 9 electrons `{:((3 + 1 + 5),,),("3p 4s 3d",,):}`