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La radioactivité est le phénomène physique par lequel des noyaux atomiques instables (dits radionucléides ou radioisotopes) se transforment spontanément en d'autres atomes ( désintégration) en émettant simultanément des particules de matière ( électrons, noyaux d' hélium, neutrons , etc.) et de l' énergie ( photons et énergie cinétique ).
4 août 2014 · La radioactivité est l’émission de rayonnement par des atomes fusionnant ou se désintégrant. (©photo) Les atomes radioactifs, appelés radio-isotopes ou radionucléides, sont des atomes dont les noyaux se désintègrent spontanément en d’autres noyaux d’atomes plus stables.
21 juin 2024 · 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 radiation.
Radioactivity. Learning Objectives. Define and give examples of the major types of radioactivity. We saw in Chapter 3 “Atoms, Molecules, and Ions” that atoms are composed of subatomic particles — protons, neutrons, and electrons.
22 févr. 2024 · 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. Radioactive isotopes, also known as radionuclides, are radioactive atoms of the same element that have different numbers of neutrons.
To define and give examples of the major types of radioactivity. Atoms are composed of subatomic particles—protons, neutrons, and electrons. Protons and neutrons are located in the nucleus and provide most of the mass of the atom, while electrons circle the nucleus in shells and subshells and account for an atom’s size.
