Glossary

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radioactive: Describes a substanceA material that is either an element or that has a fixed ratio of elements in its chemical formula. that gives off radiation‐alpha particles, beta particles, or gamma rays‐by the disintegrationThe event of a nuclear transformation caused by radioactive decay or nuclear bombardment. of its nucleusThe collection of protons and neutrons at the center of an atom that contains nearly all of the atoms's mass..