Do polyatomic ions exist by themselves?

No, because it is too reactive to exist alone. Therefore it would form nitric acid or become a metal nitrate because it will attract cations. Polyatomic ions are like all ions, they exist intermediately because they are too reactive to just stay alone.

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I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.