Molecular Properties
Nitrogen dioxide has a molar mass of 46.0055, which makes it heavier than air, whose average molar mass is 28.8. According to the ideal gas law, NO2 is therefore more dense than air.
The bond length between the nitrogen atom and the oxygen atom is 119.7 pm. This bond length is consistent with a bond order between one and two.
Unlike ozone, O3, the ground electronic state of nitrogen dioxide is a doublet state, since there is one unpaired bonding electron mostly localized on the nitrogen, which decreases the alpha effect compared to nitrite and creates a weak bonding interaction with the oxygen lone pairs.
Read more about this topic: Nitrogen Dioxide
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