What does "radioactive" mean?

Answer

According to Dictionary.com, radioactive means of, pertaining to, exhibiting, or caused by radioactivity. The term derives from the French "radio-actif," which was coined by Pierre and Marie Curie.

According to Encyclopædia Britannica, radioactivity is a property of certain kinds of matter involving the emission of energy and subatomic particles spontaneously. Unstable atomic nuclei decompose in order to reach a more stable state, thereby producing radioactive particles or electromagnetic radiation.

Half-life is the unit measurement for radioactive decay, where the time it takes for one-half of an element or isotope to decompose is determined. Half-lives range from fractions of a second to over a billion years.

1 Additional Answer
Ask.com Answer for: what does radioactive mean
ra·di·o·ac·tive
[rey-dee-oh-ak-tiv]
ADJECTIVE [PHYSICS, CHEMISTRY]
1.
of, pertaining to, exhibiting, or caused by radioactivity.
Source: Dictionary.com
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A radioactive isotope is radioactive is because the atoms that make it up are constantly giving off little pieces of itself. This is what we call radiation, those ...
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