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QUESTION
What's an ion?
An ion is an atom that has gained or lost one or more electrons.
I don't think that this is maths, but more chemistry. An ion is an atom that has a charge due to a lost or gain of electrons. Usually, ions occur when the atom tries to get a full outershell, either by losing electrons (and thus gaining a positive charge) or by gaining electrons (and thus getting a negative charge).
