## Chemistry: The Molecular Science (5th Edition)

Possible set of four quantum numbers for an electron in valence shell of Sodium atom is: $n = 3, ℓ = 0, m_{ℓ} = 0, m_{s} = +1/2$ $n = 3, ℓ = 0, m_{ℓ }= 0, m_{s} = −1/2$