In 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:
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 the Lewis structure.
In ion, the formal charge on each O-atom of the P-O bond is calculated as follows: \(\text { Formal charge }=\frac{\text { Total charge }}{\text { No.of } O \text { atoms }}=-\frac{3}{4}=-0.75\)
In the resonance structure, a total of -3 charge is distributed over four oxygen atoms.
