Question

what is meant by radioactivity
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Answer 1

Radioactivity is a physical phenomenon that some isotopes are unstable,due to the unbalanced between the nucleons in the nucleus,so some of these nucleons decay giving radiations such,electron,positron,neutron,neutrino,antineutrino,sometimes ,emition of gamma(photon),etc.for example,

P——-n+positron+ neutrino

n—→p+electron+antineutrino.

Answer 2

Answer

the property possessed by some elements (as uranium) or isotopes (as carbon 14) of spontaneously emitting energetic particles (as electrons or alpha particles) by the disintegration of their atomic nuclei