Answer
See the explanation
Work Step by Step
Certainly! Here are the Lewis structures for the given molecules and ions, including the resonance structures where applicable:
a. $NO_{2}^{-}, NO_{3}^{-}, N_{2}O_{4}$
$NO_{2}^{-}$ (Nitrite ion):
The Lewis structure for the nitrite ion, $NO_{2}^{-}$, is:
$O=N-O^-$
Resonance structure:
$O-N=O^-$
The nitrite ion has a resonance structure where the negative charge is delocalized between the two oxygen atoms.
$NO_{3}^{-}$ (Nitrate ion):
The Lewis structure for the nitrate ion, $NO_{3}^{-}$, is:
$O=N-O-O^-$
Resonance structures:
$O-N=O-O^-$
$O-N-O=O^-$
The nitrate ion has three resonance structures where the negative charge is delocalized among the three oxygen atoms.
$N_{2}O_{4}$ (Dinitrogen tetroxide):
The Lewis structure for dinitrogen tetroxide, $N_{2}O_{4}$, is:
$${O=N-O-N=O}$$
In the gas phase, $N_{2}O_{4}$ exists as a mixture of the above structure and the resonance structure:
$${O2N-NO2}$$
b. $OCN^{-}, SCN^{-}, N_{3}^{-}$
$OCN^{-}$ (Cyanate ion):
The Lewis structure for the cyanate ion, $OCN^{-}$, is:
$${O=C-N^{-}}$$
In this structure, carbon is the central atom.
$SCN^{-}$ (Thiocyanate ion):
The Lewis structure for the thiocyanate ion, $SCN^{-}$, is:
$${S=C-N^{-}}$$
In this structure, carbon is the central atom.
$N_{3}^{-}$ (Azide ion):
The Lewis structure for the azide ion, $N_{3}^{-}$, is:
$${N=N-N^{-}}$$
