The correct set of four quantum numbers for the outermost electron of sodium (Z=11) is

Options

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

Answer

D

Explanation

E.C. of Na ( Z = 11) = `1 s^(2) 2 s^(2) 2p^(6) 3s^(1)`
Outermost electron occupies 3s orbital.
`therefore n = 3 , l = 0 , m = 0 , s = (1)/(2)`