# What is the electron configuration of an element with atomic number 9?

Oct 20, 2016

$1 {s}^{2} 2 {s}^{2} 2 {p}^{5}$

#### Explanation:

Atomic number 9 is the element Florine

Florine has 9 electrons as well as the 9 protons that determine its atomic number.

The ground state configuration is the lowest energy configuration.

so $1 {s}^{2} 2 {s}^{2} 2 {p}^{5}$