Question

the possible set of quantum numbers (n,l,m,s) of the last electron of unipositive potassium ion :
A. `5,0,0,-(1)/(2)`
B. `5,0,1,(1)/(2)`
C. `5,1,0,(1)/(2)`
D. none of these

Answer 1

Correct Answer - d
`""_(19)K^(+) =1s^(2)2s^(2)2p^(6)3s^(2)3p^(3)`
(unipostiive potassium ion )
last `e^(-)` goes into 3p subshell
So , `n=3,l=1,,0,1,s=+(1)/(2),-(1)/(2)`