Answer :
The formal charge on Nitrogen in no3- is 1.
The number of electrons that an atom "owns" is subtracted from the overall number of valence electrons to determine the formal charge that is given to it. The total of the unshared valence electrons plus half of the shared valence electrons is the number of electrons that are considered to be "owned" by a particular element.
Formal charge =( valence electrons - Non-bonding electrons-Bonding electrons/2)
For Nitrogen = 5 - 0 - 8/2
= +1
For single bonded oxygen = 6 - 6 - 2/2
= -1
For double bonded oxygen = 6 - 4 - 4/2
= 0
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