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`.