# Question #a84f7

Jan 22, 2015

The maximum number of electrons which an energy level can hold is equal to $2 {n}^{2}$ where $n$ is the principal quantum number.

If $n = 1$ the maximum number of electrons = $2 \times {1}^{2} = 2$

So there are a maximum of 2 electrons in the $n = 1$ energy level.

If $n = 2$ the maximum number of electrons = $2 \times {2}^{2} = 8$ electrons

If $n = 3$ the maximum number of electrons =$2 \times {3}^{2} = 18$ electrons.

And so on.