[Selsunblue3]

Which of the following has an unpaired electron:
1. NO2
2. N2H4
3. N2O4
4. N20
5. N2

How do i work out the number of unpaired electrons?, could someone give me a few calculations of these (just one will do)?.

[sjb]

Which of the following has an unpaired electron:
1. NO₂
2. N₂H₄
3. N₂O₄
4. N₂O
5. N<sub>2

How do i work out the number of unpaired electrons?, could someone give me a few calculations of these (just one will do)?.</sub>

Can you draw some Lewis structures?