The formal charge of an atom in a polyatomic molecule or ion may be defined as the difference between the number of valence electrons of that atom in an isolated or free state and the number of electrons assigned to that atom in the Lewis structure. It is expressed as :
`[{:("Formal charge [F.C]"),("on an atom in a Lewis"),("structure"):}]=[{:("Total number of valence"),("electrons in the free"),("atom"):}]`
`-[{:("Total number of non-"),("bonding (lone pair)"),("electrons"):}]-((1)/(2))[{:("Total number of"),("bonding shared"),("electrons"):}]`
Select correct feature about `CO_(3)^(2-)` carbonate ion in one of the Lewis structure based on the presence of two single bonds and one double bond between carbon and oxygen atoms.

Options

A. Total number of lone pairs = 8
B. Formal charge on two oxygen = `-1` and one oxygen = zero
C. Oxidation number of `C=+4` and formal charge on C = zero
D. All are correct

Answer

D

Explanation