Based on the "best"Lewis structure from formal charge considerations, how many resonance structures, if any, can be drawn for the PO₄^3- ion?

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The phosphate ion (PO₄³⁻) has four resonance structures. Each structure involves one of the oxygen atoms forming a double bond with the phosphorus atom, while the other three oxygen atoms have single bonds and carry a negative charge. This distribution of electrons minimizes formal charges across the molecule.

Based on the "Best"Lewis Structure from Formal Charge Considerations, How