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Radioactive decay - Wikipedia
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 radiation. A material containing unstable nuclei is considered radioactive. Three of the most common types of decay are alpha, beta, and gamma decay.

Radioactivity | Definition, Types, Applications, & Facts | Britannica
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.

Radioactivity: Definition, Types, Formula, and Applications - Science Facts
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 the form of radiation. This radiation can be emitted as particles or electromagnetic waves, depending on the nature of the decay.

What is Radioactivity - Definition, Laws, Units, Alpha Decay, Uses of ...
Radioactivity is the result of the decay of the nucleus. The nucleus’s decay rate is independent of temperature and pressure. Radioactivity is dependent on the law of conservation of charge. The physical and chemical properties of the daughter nucleus are different from the mother nucleus.

Radioactivity and the Types of Radioactive Decay - Science Notes and ...
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, but there are other nuclear reactions responsible for radioactivity.

What Is Radioactivity? - Energy.gov
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 shift to a more stable configuration.

DOE Explains...Radioactivity | Department of Energy
Radioactivity is the release of energy from the decay of the nuclei of certain kinds of atoms and isotopes. Atomic nuclei consist of protons and neutrons bound together in tiny bundles at the center of atoms.

Science Made Simple: What Is Radioactivity? - SciTechDaily
Radioactivity is the release of energy from the decay of the nuclei of certain kinds of atoms and isotopes. Atomic nuclei consist of protons and neutrons bound together in tiny bundles at the center of atoms.

The Radioactive Atom: An Overview | Radiation and Your Health - CDC
Radioactivity is the spontaneous release of energy from an unstable atom. Radioactive material is a solid, liquid, or gas that gives off radiation. Radiation is the energy that comes out of a radioactive atom.

14.1: Radioactivity - Chemistry LibreTexts
These emanations were ultimately called, collectively, radioactivity. There are three main forms of radioactive emissions. The first is called an alpha particle, which is symbolized by the Greek letter α. An alpha particle is composed of two protons and two neutrons, and so it is the same as a helium nucleus. (We often use \(\ce{^{4}_{2}He ...

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