Uses of isotopes and positive and negative parts about the uses

Question

What are some isotopes that have real world uses ( such as radiation)? and also what are the positive and negative sides of such isotopes? for example i know radiation ( i don't know the isotope name) can make x rays and can help cancer patients but i also know it can be toxic to the body.

Answer 1

BASEBALL

Answer 2

Look up "radioisotopes" and the articles that this one will lead you to in Wikipedia.  A very good short summary.

Answer 3

isotopes is the no of electrons to complete its duplet or octet.