if the valency of nitrogen is 3 then how is the formula of nitrogen oxide NO2 and not N2O3 - Science - Acids Bases and Salts

Question

if the valency of nitrogen is 3 then how is the formula of
nitrogen oxide NO2 and not N2O3??

Shalini Pandey · Accepted Answer

Nitrogen has 5 valence electrons and hence shows the valency of
3 and also 5 In case of N2O3 its valency has
been satisfied so it forms respective oxide but in case of
NO2 its valency is not satisfied and hence it exists as
dimer i e N2O4
From the structure the satisfied valencies of Nitrogen can be
seen, which are found in its oxides
<img alt="" src=
"https://s3mn%20mnimgs%20com/img/shared/discuss_editlive/5181409/2013_07_22_17_44_43/5424068%20png">

if the valency of nitrogen is 3 then how is the formula of nitrogen oxide NO2 and not N2O3??