General Formulas for Nitrogen Dioxide

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Nitrogen Dioxide (NO2) has 17 valence electrons, resulting in a molecular structure featuring a single bond with one oxygen and a double bond with the other, aligning with the general formula AX2. The presence of a lone electron on nitrogen classifies NO2 as a free radical, contributing to its high reactivity. Incorporating an additional electron transforms NO2 into the more stable ion NO2-, enhancing its stability. Understanding the implications of the lone electron is crucial for grasping the chemical behavior of nitrogen dioxide.
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Nitrogen Dioxide has 17 valence electrons, therefore it has a single bond between one oxygen and a double bond between the other, creating a general formula of AX2, however I do not understand how to incorporate the lone electron on nitrogen into the general formula.

Does adding another electron, which then creates a pair work?
 
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The lone electron on nitrogen makes NO2 a free radical, which means it is highly chemically reactive.

Adding an electron gives you the ion NO2-, which is more stable.
 

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