Answer :
The formal charge of nitrogen atom that has no lone pairs and forms two double bonds is -3.
The formal charge of an atom is the difference between the number of valence electrons of an atom in its free state as well as the number of electrons assigned to that atom in a molecule.
For nitrogen (N), the number of valence electrons in its free state will be 5. In a molecule where it forms two double bonds, nitrogen will share a total of 8 valence electrons (4 from each bond) with other atoms. Therefore, the number of electrons assigned to nitrogen is 8.
To calculate the formal charge of nitrogen in this case, we can use the formula: Formal charge = valence electrons - assigned electrons
Substituting the values for nitrogen, we get:
Formal charge of nitrogen = 5 - 8 = -3
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