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Oct 24, 2025 · radioactivity, property exhibited by certain types of matter of emitting energy and subatomic particles spontaneously. It is, in essence, an attribute of individual atomic nuclei.

Radioactive decay (also known as nuclear decay, radioactivity, radioactive disintegration, or nuclear disintegration) is the process by which an unstable atomic nucleus loses energy by …

The meaning of RADIOACTIVE is of, caused by, or exhibiting radioactivity. How to use radioactive in a sentence.

As its name implies, radioactivity is the act of emitting radiation spontaneously. This is done by an atomic nucleus that, for some reason, is unstable; it "wants" to give up some energy in order to …

RADIOACTIVE definition: 1. having or producing powerful and dangerous energy that comes from the breaking up of atoms: 2…. Learn more.

The Nuclear Regulatory Commission's Science 101: What Are The Different Types of Radiation? In earlier Science 101s, we talked about what makes up atoms, chemicals, matter and ionizing …