the spontaneous emission of radiation from the nucleus  of an atom

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the dense center of an atom; part of an atom containing all of the positive charge and almost all of the mass of the atom

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a postitivley subatiomic particle contained within the nucleus of an atom; had an electric charge of   +1;stable when outside of the nucleus

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unchrged subatomic particle ion nucleus of an atom, similar in mass of a proton

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Isotope

same element but a different mass number; has the same number of protons but different number of neutrons

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when a unstable nucleus emits radiation in the form of an alpha particle, beta particle, or gamma ray

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Parent Nucleus

refers to the  nucleus that produces a daughter nucleus as a result of radioactive decay

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Daughter Nucleus

refers to the nucleus produced as a result of radioactive decay.

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Alpha Particle

constists of two protons and two neutons: emmited during alpha decay of a radioactive atom

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