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.
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There are two pi bonds.
H3O, Hydronium ion, has a total of three hydrogen bonds. These are single bonds from hydrogen to oxygen and form cation with +1 charge.
The atomic number of carbon is 6 It is a negative ion
a ill-ion
The oxidation number of nitrogen in the nitrate ion NO3- is 5