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Radioactive, as applied to an atom, means the nucleus is unstable, and "wants" to change into something else, either by emitting particles or energy. or by absorbing particles or energy.

Answ2. Radioactivity is a one-way street. It only loses total energy.

BUT it is possible to add energy/mass to a simple atom; as obviously happens in super nova by the process of fission.

This can also be done in an linear accelerator by accelerating a mass and firing it into a target.

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14y ago

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