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