Radioactive decay is a spontaneous process in which an unstable nucleus changes into a more stable nucleus by emitting radiation.
An unstable nucleus emits radiation in the form of alpha particles, beta particles or gamma rays.
Alpha decay is a spontaneous process of emitting an alpha particle from an unstable nucleus.
Beta decay is a spontaneous process of emitting a bata particle from an unstable nucleus.
Gamma decay is a spontaneous process of emitting gamma ray from an unstable nucleus.
The unstable nucleus before a radioactive decay is known as the parent nuclide. During radiactive decay, the parent nuclide is transformed into a more stable nucleus known as the daughter nuclide.
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