Question

The four quantum number for the valence shell electron or last electron of sodium (Z=11) is
A. n=2, l=1, m=-1, `s=-1/2`
B. n=3, l=0, m=0, `s=-+ 1/2`
C. n=3, l=2, m=-2, `s=-1/2`
D. n=3, l=2, m=2, `s=+ 1/2`

Answer 1

Correct Answer - B
`Na_11=2,8,1=1s^2, 2s^2 2p^6, 3s^1`
n=3, l=0, m=0, s=+1/2