what is a radioactive element
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which spontaneous releases the radioactive radiation
example...
all elements which have atomic no above 83 r radiocactive
Uranium (atomic no 235)
radium
thorium
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An element subject to spontaneous degeneration of its nucleus accompanied by the emission of alpha particles, beta particles, or gamma rays. All elements with atomic numbers greater than 83 are radioactive. Naturally occurring radioactive elements include radium, thorium, and uranium.
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