Write the steps involved in writing the chemical formula of calcium phosphate.


To write the formula of calcium phosphate, we first write the symbols for calcium and phosphate ions along with their charges. 

                            Ca²+ (calcium), (PO4)³ (phosphate)

There are no common factors in the number corresponding to their charges. We now crisscross their charges and write the crisscrossed numbers as subscripts against the two charges.

                              Ca2+ X (PO4)3-  →  Ca3(PO4)2