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

Options

A. `4, 1, 0, (1)/(2)`
B. `3, 1, 0, (1)/(2)`
C. `4, 0, 0, (1)/(2)`
D. `3, 0, 0, (1)/(2)`

Answer

C

Explanation

`K(Z =19) : 1s^(2) 2s^(2) 2p^(6) 3s^(2) 4s^(1)`
Outermost electron : `4s^(1)`
`n = 4, l = 0, m = +1//2` or `-1//2`