* Ca₃: This indicates there are 3 calcium (Ca) atoms.
* (PO₄)₂: This indicates there are two phosphate (PO₄) groups.
* Each PO₄ group: Contains 1 phosphorus (P) atom and 4 oxygen (O) atoms.
Calculation:
* Calcium atoms: 3
* Phosphorus atoms: 2 (PO₄ groups) * 1 (P atom per group) = 2
* Oxygen atoms: 2 (PO₄ groups) * 4 (O atoms per group) = 8
Total: 3 + 2 + 8 = 13 atoms
