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16.1 and 2

Vocab for Chapter 16 Sections 1 & 2

TermDefinition
radioactivity the process by which an unstable nucleus gives off nuclear radiation
mass number the sum of the numbers of protons and neutrons in the nucleus of an atom
isotope an atom that has the same number of protons (or the same atomic number) as other atoms of the same element do but that has a different number of neutrons (and thus a different atomic mass)
half-life the time required for half of a sample of a radioactive isotope to break down by radioactive decay to form a daughter isotope
nuclear fission the process by which the nucleus of a heavy atom splits into two or more fragments; the process releases neutrons and energy
nuclear chain reaction a continuous series of nuclear fission reactions
nuclear fusion the process by which nuclei of small atoms combine to form a new, more massive nucleus; the process releases energy
Created by: whiskers426
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