How many atoms of calcium are in \( \mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2} \) ?

In the chemical formula \( \mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2} \), the subscript numbers indicate the number of each type of atom present in one formula unit of calcium phosphate. - **Calcium (Ca):** The subscript **3** outside the calcium symbol \( \mathrm{Ca}_{3} \) indicates that there are **3 calcium atoms**. - **Phosphate (\(\mathrm{PO}_{4}\)):** The subscript **2** outside the parentheses \( \left(\mathrm{PO}_{4}\right)_{2} \) means there are 2 phosphate groups. Each phosphate group contains 1 phosphorus (P) atom and 4 oxygen (O) atoms, but since the question is specifically about calcium atoms, we will focus on calcium. **Summary:** There are **3 calcium atoms** in one formula unit of \( \mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2} \).