Here's how to arrive at this formula:

* Cadmium (Cd) has a +2 charge.

* Phosphate (PO₄) has a -3 charge.

* To balance the charges, we need three cadmium ions (3 x +2 = +6) and two phosphate ions (2 x -3 = -6).

This gives us the final formula: Cd₃(PO₄)₂.