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

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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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Problem Details

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

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Resonance Structures concept. You can view video lessons to learn Resonance Structures. Or if you need more Resonance Structures practice, you can also practice Resonance Structures practice problems.

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Based on our data, we think this problem is relevant for Professor Montano's class at UIC.