To count atoms easily, how can the formula of calcium phosphate, Ca3(PO4)2, be rewritten in a simpler format?

1. The bracket subscript 2 multiplies everything inside the parentheses. 2. Two phosphate groups give 2 phosphorus atoms and 2 x 4 = 8 oxygen atoms. 3. With the 3 calcium atoms the simple format is Ca3P2O8. 4. Reading the bracket contents only once gives Ca3PO4, which loses a whole phosphate group. _Source: OpenStax Chemistry (CC BY 4.0), Ch 3 "Composition of Substances and Solutions", section 3.1 Formula Mass and the Mole Concept_