# What ion will be formed by the selenium atom shown below when it has a stable set of valence electrons?

##### 1 Answer
Dec 18, 2016

$S {e}^{2 -}$

#### Explanation:

It will want to fill its outer shell with 8 electrons (the octet rule). To do this it will have to gain 2 electrons, hence the $2 -$

Note: selenium behaves much like sulphur.