Out of the following which is the correct set of quantum number for outermost electron of potassium (Z = 19) ?

Options

A. `{:(n,l,m,s),(4,3,2,-1//2):}`
B. `{:(n,l,m,s),(4,2,0,-1//2):}`
C. `{:(n,l,m,s),(4,1,0,+1//2):}`
D. `{:(n,l,m,s),(4,0,0,-1//2):}`

Answer

D

Explanation

`K(Z = 19) : [Ar]^(18) 4s^(1)`
Outermost electron : `4s^(1)`
`n = 4, l = 0, m = 0, s = +1//2` or `-1//2`