Question

what is the correct formula for calcium oxide?

Explanation:

Step1: Determine the charges

Calcium (Ca) has a charge of \(+2\), oxygen (O) has a charge of \(-2\).

Step2: Use the criss - cross method

The charges cancel out (\(+2\) and \(-2\)), so the formula is \(CaO\).

Answer:

A. \(CaO\)