Definition:Radioactive Decay/Radioactive Isotope

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Definition

An isotope of a chemical element which is subject to radioactive decay is known as a radioactive isotope.


Half-Life

The half-life of a radioactive isotope is the time it takes for exactly half of an arbitrary quantity of that isotope to undergo radioactive decay.

Thus it is the time it takes for exactly half of an arbitrary quantity of that isotope to remain.