Match the key terms with the descriptions provided.
(a) the smallest amount of fissionable material necessary to support a continuing chain reaction
(b) the splitting of a heavy atom into two or more lighter atoms and some number of neutrons with the release of energy
(c) a nuclide containing two protons and two neutrons; the nucleus of a helium-4 atom
(d) having the ability to emit ionizing radiation spontaneously
(e) the highest-energy and most-penetrating type of electromagnetic radiation
(f) a nuclear reaction that is induced by the impact of a nuclide or a subatomic particle on another nuclide
(g) a nuclear particle (neutron or proton)
(h) emission of particles or electromagnetic waves
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