# How many unpaired electrons are there in aluminum?

Nov 10, 2016

There is only 1 unpaired electron in the outer energy level. The one is the orbital $3 {p}^{1}$.
The full configuration is $1 {s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{2} 3 {p}^{1}$.