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Atomic Energy

Chapter 16 Vocabulary

WordDefinition
radioactivity the process by which an unstable nucleus gives off nuclear radiation
mass number the sum of numbers of protonsand neutrons in the nucleus of an atom
isotopes atoms that have the same number of protons as other atoms of the same element do but have different number of neutrons
half-life the amount of time it takes one-half of the nuclei of a radioactive isotope to decay
nuclear fission the process by which a large nucleus splits into two small nuclei and releases energy
nuclear chain reaction a continuous series of nuclear fission reactions
nuclear fission two or more nuclei that have small masses combine,or fuse, toform a larger nucleus
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