radioactive material, or the nucleus of an atom that has an unbalanced number of protons or neutrons. Unstable atomic nuclei lose energy by emitting radiation and subatomic particles.
the giving off of rays of energy or particles by the breaking apart of atoms of certain elements (as uranium) 2 : the rays or particles that are given off when atoms break apart.
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radioactive material, or the nucleus of an atom that has an unbalanced number of protons or neutrons. Unstable atomic nuclei lose energy by emitting radiation and subatomic particles.
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the giving off of rays of energy or particles by the breaking apart of atoms of certain elements (as uranium) 2 : the rays or particles that are given off when atoms break apart.
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