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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 …

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 …

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

Feb 22, 2024 · But some atoms have an unstable combination blend of protons and neutrons, and these are considered radioactive. To get to a more stable state, the atom expels energy from …

May 30, 2021 · Radioactivity is the spontaneous emission of ionizing radiation from nuclear decay and reactions. The three main types of radioactive decay are alpha, beta, and gamma decay, …

May 29, 2024 · Radioactivity occurs when an unstable atomic nucleus loses energy by emitting radiation. This instability arises from an imbalance in the number of protons and neutrons …