There are two pi bonds.
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Oh, dude, you're hitting me with some chemistry now! So, the oxalate ion C2O4^2- has two double bonds, which means it has two pi bonds. It's like the cool kid in chemistry class with those two pi bonds, making it all stable and stuff.
The atomic number of carbon is 6 It is a negative ion
H3O, Hydronium ion, has a total of three hydrogen bonds. These are single bonds from hydrogen to oxygen and form cation with +1 charge.
a ill-ion
The oxidation number of nitrogen in the nitrate ion NO3- is 5