1- am not sure, but i think they are some how involved in emitting positrons during some kinds of radiactive decay.
2-Nop, to be an isotope you'll have to have your twin, with the same name, and everything except the physical appearance :lol: hope you do know what i mean. i'm not very sure if i know the answer to the second part of your Question. They give the element diffferent physical functions, i guess! :roll:
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