Resonance Structures Video Lessons

Concept:

# Problem: The following ions are best described with resonance structures. Draw the resonance structures, and using formal charge arguments, predict the best Lewis structure for each ion.A. NCO−  B. CNO−

###### FREE Expert Solution

We are being asked to identify the resonance structures of NCO- and CNO

We will have to draw the Lewis Structures first.

Step 1: Determine the central atom in this molecule.
C is the central atom for NCO-

N is the central atom for CNO

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

CH3COO-:

Group              Valence Electrons

C         4A                    4 valence e x 1

N         5A                    5 valence e x 1

O         6A                    6 valence e- x 1
= 15 valence e

-1 charge                     +1 e­-

Total = 16 valence e-

Step 3: Draw the Lewis Structure for the molecule

O, N and C → prefers to have complete octet (8 e- around them)

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###### Problem Details

The following ions are best described with resonance structures. Draw the resonance structures, and using formal charge arguments, predict the best Lewis structure for each ion.

A. NCO
B. CNO