Answer :

Five resonance structures are possible for the phosphate ion, PO₄³⁻ and the formal charge are on the each oxygen atom

Resonance structure is the set of Lewis structure that describe the delocalization of electron in a polyatomic ion or a molecule

We can draw five resonance structure for PO₄³⁻ but one of them is  a minor contribution to the resonance hybrid and four oxygen atom single bonded to a phosphorus atom and give every atom an octet and this is not a good structure because it has five atom with formal charges and reduce the number of charges by moving electron to convert a P-O single bond to a P=O double bond and there are four P-O bonds and these are all equivalent and are the major contribution to the resonance hybrid that's why the actual structure is a resonance hybrid of all five structure

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