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  4. In the following electron-dot structure, calculate the formal charge on each nitrogen atom from left to right.

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Q. In the following electron-dot structure, calculate the formal charge on each nitrogen atom from left to right.Chemistry Question Image

JIPMERJIPMER 2015Chemical Bonding and Molecular Structure

Solution:

Formal charge on an atom
= total no. of valence electrons in the free atom - total no. of non-bonding electrons $- \frac{1}{2} \times $ total no. of bonding electrons
$ N^1 = 5 - 4 - \frac{1}{2} \times 4 = 5 - 6 = - 1$
$ N^2 = 5 - 0 - \frac{1}{2} \times 8 = 5 - 4 = +1$
$ N^3 = 5 - 4 - \frac{1}{2} \times 4 = - 1$

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