The four quantum number of the valence electron of potassium are.

Options

A. `4,1,1,1//2`
B. `4,0,0,1//2`
C. `4,1,0,1//2`
D. `4,4,0,1//2`

Answer

B

Explanation

The electronic configuration of K (Z =19) is `1s^(2)2s^(2)2p^(6)3s^(2) 3p^(6) 4s^(1)`. The last electron is in 4s.
`:. n = 4, l = 0, m_(s) = +(1)/(2)`