What happens during one half-life of a radioactive isotope?

What happens during on half-life of a radioactive isotope is the following: Not only does it decay by giving off energy and matter, but it also decays at a rate that is characteristic to itself. The rate at which a radioactive isotope decays is measured in half-life. The term half-life is defined as the time it takes for one-half of the atoms of a radioactive material to disintegrate.

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