Radioactivity is the physical phenomenon of certain elements - such as uranium - of emitting energy in the form of radiation. This energy comes from the decay of an unstable nucleus.
Radioactivity is the physical phenomenon of certain elements - such as uranium - of emitting energy in the form of radiation. This energy comes from the decay of an unstable nucleus.
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Radioactivity is the physical phenomenon of certain elements - such as uranium - of emitting energy in the form of radiation. This energy comes from the decay of an unstable nucleus.
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Radioactivity is the physical phenomenon of certain elements - such as uranium - of emitting energy in the form of radiation. This energy comes from the decay of an unstable nucleus.
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