The correct set of four quantum numbers for outermost electron of potassium (Z = 19) is:

Options

A. n=2,l=0, m=0, `s= + 1/2`
B. n=4,l=0, m=0, `s= + 1/2`
C. n=3,l=1, m=1, `s= + 1/2`
D. n=4,l=2, m=-1, `s= + 1/2`

Answer

B

Explanation

`K_19=1s^2 ,2s^2 2p^6 , 3s^2 3p^6 ,4s^1`
for `4s^1` electrons.
n=4, l=0, m=0 and `s=+1/2`