What is the ions and crisscross method for calcium phosphate?

The ions for calcium phosphate are calcium ions (Ca²⁺) and phosphate ions (PO₄³⁻). To use the crisscross method, you take the absolute values of the charges of the ions and swap them to determine the subscripts in the formula. Therefore, the formula for calcium phosphate is Ca₃(PO₄)₂, indicating three calcium ions and two phosphate ions to balance the charges.