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Dec 4, 2016 · The meaning of RADIOACTIVE is of, caused by, or exhibiting radioactivity. How to use radioactive in a sentence.

Dec 6, 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 definition: 1. having or producing powerful and dangerous energy that comes from the breaking up of atoms: 2…. Learn more.

If the source of the ionizing radiation is a radioactive material or a nuclear process such as fission or fusion, there is particle radiation to consider. Particle radiation is subatomic particles …

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 …

As previously indicated, large unstable atoms become more stable by emitting radiation to get rid of excess atomic energy (radioactivity). This radiation can be emitted in the form of positively …

May 1, 2025 · These unstable atoms release excess energy in the form of radiation — a process called radioactive decay. As atoms decay, they turn into different elements or isotopes in their …

Feb 22, 2024 · Radioactive material is a solid, liquid, or gas that gives off radiation. Radiation is the energy that comes out of a radioactive atom. Radioactive isotopes, also known as …

Jun 10, 2025 · Radioactivity occurs when an atom has an excess of energy, mass, or both, making its nucleus unstable. To reach a lower, more stable energy level, it releases energy in …