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5 I understand how the nitrite $\ce {NO2}$ ion can be formed and have a negative charge, but the nitrate $\ce {NO3}$ ion is confusing me. I made some simple drawings to try to explain what I don't understand: Does the "electron from outside" that the oxygen receives, as indicated in the drawing, comes from the nitrogen atom?
All the examples of $\ce{NO3-}$ salts are soluble in water (all that I know about). Is it always so or there is some salt which doesn't dissolve in water? If so what is the reason behind it?
For the nitrate ion (NO3-), there is one double bond that leads to resonance amongst all three of the nitrogen-oxygen bonds. This effectively gives each bond the characteristic of 1.3 bonds, and slightly longer than in the nitrite ion.
0 I'm practicing lewis structures and I'm stuck on the one for NO3 -1 (nitrate ion). I understand that N has to be the central atom because it is the least electronegative, but I'm confused why all the O have to be bonded to the N atom. With O=N-O-O, you get 3 zero formal charges and one -1 instead of one zero, two -1 and one 1, which seems better.