What is the formal charge on phosphorus in a Lewis structure for the phosphate ion that satisfies the octet rule ?
What is the formal charge on phosphorus in a Lewis structure for the phosphate ion that satisfies the octet rule ?
Posted Sep 29 2019
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The PO4 3-ion Lewis dot structure can be expressed in two ways.
In first way the P atom is doubly bonded to one of the O atoms and singly bonded to other 3 atoms. This lewis dot structure clearly does not comply with the octet rule as it will have 10 electrons in the valence shell of P. The formal charge on P would be 0 for this structure. Formal charge on doubly bonded O would be 0 and 3 singly bonded O's would be -1.
The other structure would be a single bond of P to all 4 O atoms. That structure would satisfy the octet. For this case the formal charge on P would be +1 and all the 4 O atoms would be -1. So the answer would be +1.
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