# What is the electron configuration of an element with atomic number 19?

Jul 28, 2017

$1 {s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{2} 3 {p}^{6} 4 {s}^{1}$

#### Explanation:

This is the electron configuration of Potassium K # 19
There are 2 electrons in the first shell
There are 8 electrons in the second shell
There are 8 electrons in the third shell
leaving only 1 electron in the fourth and valence shell.

This results in ionized potassium almost always having a charge of ${K}^{+}$:

$K \to {K}^{+} + {e}^{-}$