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Terms in this set (68)
What is radiation? Energy in motion.
Define radioactivity. Spontaneous emission of radiation from the nucleus of an unstable atom.
What is an isotope? Atoms with the same number of protons but different numbers of
neutrons.
What is a radioisotope? An unstable isotope of an element that decays or disintegrates
spontaneously, emitting radiation.
How many natural and artificial radioisotopes have Approximately 5,000.
been identified?
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