Complete and balance the following equations:

$\mathrm{Ca}+{\mathrm{O}}_2\to$

A metal combines with oxygen to form oxides. The tendency to react with oxygen is different for each metal. Sodium oxide and Potassium oxide are examples of metal oxides.

The complete and balanced reaction is given as:

$$\begin{gathered} 2\mathrm{Ca}\left(\mathrm{s}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)\to 2\mathrm{CaO}\left(\mathrm{s}\right) \\ \mathrm{Calcium}\mathrm{Oxygen}\mathrm{Calcium}\mathrm{oxide} \end{gathered}$$