What is the total spin and magnetic moment of an atom with atomic number `7`?

Explanation

The atom number of the electron is `7` , so the electronic confguration is `1s^(2)2s^(2)2p^(3)`

Therefore the number of unpaired electron I s (n) `3`
Total spin of electron `= +- (1)/(2) n = +- (1)/(2) xx 3 = +- (3)/(2)`
Magnetic moment of the element `sqrt(n(n+2))BM`
`= sqrt(3(3 +2))BM`
`= sqrt(15)BM`