For the phosphoric acid molecule (H3PO4), all four oxygen atoms are bonded to the central phosphorus atom and the three hydrogen atoms are bonded to different oxygen atoms. Several resonance structures can be drawn for H3PO4 but one structure is more important than the others. In the most important structure, the phosphorus atom has:         a formal charge of +1 and a complete octet       a formal charge of zero and a complete octet       a formal charge of −1 and an expanded octet       a formal charge of +5 and an expanded octet       a formal charge of zero and an expanded octet

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