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The formal charge of an atom in a polyat...

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"):}]`
Find the formula charge on ''O'' atom in given structure (I) and (II) respectively:
(I) `:overset(..)underset(..)O-C-=N:" (II)":underset(..)O=C=N:`

A

`-1,-1`

B

`-2,0`

C

`-1,0`

D

`0,-1`

Text Solution

Verified by Experts

The correct Answer is:
C
`.^(Theta)underset(-1)O-underset(0)C-=underset(0)N" "underset(0)O=underset(0)C=underset(-1)N^(Theta)`
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