Textbook Problem

Determine the number of each type of atom in each chemical formula:

$\begin{array}{l}\text{a}{\text{. Na}}_{\text{2}}\text{O}\hfill \\ \text{b}{\text{. CF}}_{\text{2}}{\text{Cl}}_{\text{2}}\hfill \\ \text{c}{\text{. K}}_{\text{2}}{\text{CO}}_{\text{3}}\hfill \\ \text{d}\text{. Mg}{\left({\text{HCO}}_{\text{3}}\right)}_{\text{2}}\hfill \end{array}$