# What is the name of the ionic compound CaO?

Jun 14, 2016

Calcium oxide
(common name: quicklime)

#### Explanation:

Calcium $C a$ is a metal, and is the compound's first name .
Compounds with oxygen $O$ are called oxides. "-ide" is always a last name .

Since only $C a O$ exists (one-to-one), no further specification is needed
(compare $C O$ carbon monoxide and $C {O}_{2}$ carbon dioxide)