# What do elements in a group have in common?

Jul 6, 2017

elements in a group have a similar electron configuration which differs in the size of the outer shell.

#### Explanation:

Take the elements of group I A all of them have a single s electron on the outermost shell

$L i = 2 {s}^{1}$
$N a = 3 {s}^{1}$
$K = 4 {s}^{1}$

The similar outer shell electron configuration results in similar chemical properties and reactions.