Question

explain radioactivity

Answer 1

Hi ,

Radioactivity is the spontaneous emission of energy from unstable atoms. As you know atoms are found in all matter. There are stable atoms, which remain the same always, and unstable atoms, which break down or 'decay' into new atoms. These unstable atoms are said to be 'radioactive', because they emit radioactivity from the nucleus as they decay. The phenomenon of radioactivity is observed in heavy elements such as uranium. A.H Bacqueral, a French scientist discovered radioactivity in 1896 by chance while performing an experiment. So radioactivity refers to the particles which are emitted from nuclei as a result of nuclear instability.

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Answer 2

Radioactivity is the spontaneous emission of radiation in the form of particles or high energy photons resulting from a nuclear reaction.