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Solution: Draw the Lewis structures for three resonance forms of nitrate, NO 3-. Include electron lone pairs, and any formal charges.

Problem

Draw the Lewis structures for three resonance forms of nitrate, NO 3-. Include electron lone pairs, and any formal charges.

Solution

We are being asked to identify the three resonance forms of NO3-

First, we will have to draw the Lewis Structure of NO3-.


Step 1: Determine the central atom in this molecule.

N → less electronegative atom than O → central atom


Step 2: Calculate the total number of valence electrons present.          

NO3-:

           Group              Valence Electrons

N         5A                    5 valence e
O         6A                    6 valence e- x 3
                                   = 23 valence e
-1 charge                     +1 e­-
                                    Total = 24 valence e- 


Step 3: Draw the Lewis Structure for the molecule

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