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| The mass of a nucleus is heavier than all the protons and neutrons that make it up. |
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| Spontaneous disintegration of the atomic nucleus of some chemical elements with the emission of energetic and charged particles (alpha, beta and gamma rays |
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| The spontaneous change in the nucleus of an atom. |
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| the conversion of one element to another |
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| When a radioactive nucleus goes through a transmutation. |
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| is the process in which the nuclei of several light atoms combine to form a single heavy nucleus with a release of energy. |
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| is the process in which a heavy nucleus splits into two pieces with the release of a huge amount of energy. |
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| The physical theory of the composition and behavior of atoms and subatomic particles; explains the duality of light as wave and particle, the existence of chemical bonds, and radioactivity. |
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| this occurs when a photon strikes a metal surface causing an electron to be ejected. |
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| means that an atom looses an electron (or several) and becomes an ion. |
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| Devised in 1905, the theory that space and time are relative concepts rather than absolute concepts |
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