The correct set of quantum numbers for the valence electrons of rubidium atom (Z=37) is

Options

A. `5,0,0,+1//2`
B. `5,1,0,+1//2`
C. `5,1,1,+1//2`
D. `5,0,1,+1//2)`

Answer

A

Explanation

The electronic configuration of rubiduim
(Z=37) is
`1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(10)4s^(2)4p^(6)5s^(1)`
Valence electron is `5s^(1)`.
Quantum number n=5, l=0, m=0, `s=+1//2`