Ncert Exercises & Solutions

In ${PO}_{4}^{3 -}$ ion, the formal charge on the oxygen atom of the P-O bond is :

1.	+1	2.	–1
3.	–0.75	4.	+0.75

HINT:

Formal

charge = T otal

charge Number

of

O - atom

Explanation:

The formal charge over an atom of a polyatomic molecule or ion is the difference between the valence electron of that atom in the elemental state and the number of electrons assigned to that atom in Lewis structure.

{PO}_{4}^{3 -}

ion, the formal charge on each O-atom of P-O bond is calculated as follows:

Formal

charge = Total

charge Number

of

O - atom = - \frac{3}{4} = - 0.75

In the resonance structure, a total of -3 charge is distributed over four oxygen atoms.

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