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| Collective atoms; protons and neutrons. |
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| Atom that is identified by the number of protons and neutrons in it, nucleus |
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Reaction that affects the nucleus of an atom
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| Change in the identity of a nucleus as a result of a change in the number of protons |
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| Spontaneous disintegration of a nucleus into a slightly lighter nucleus, accompanied by emission of particles, electromagnetic radiation, or both. |
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| particles or electromagnetic radiation emitted from the nucleus during radioactive decay. |
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Radioactive Nuclide
Marie and Pierre Curie |
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| An unstable nucleus that undergoes radioactive decay. Who? concluded that only uranium and thorium were radioactive. They discovered two new radio active elements, polonium and radium. |
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| two protons and two neutrons bound together and is emitted from the nucleus during some kinds of radioactive decay. Helium particles with charge of 2+ |
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| an electron emitted from the nucleus during some kinds of radioactive decay |
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| Electron with positive charge |
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| inner orbital electron is captured by the nucleus of its own atom. |
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| Series of radioactive nuclides produced by successive radioactive decay until a stable nuclide is reached |
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| Heaviest nuclide of each decay series |
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| Nuclides produced by the decay of the parent nuclide |
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| bombardment of nuclei with charged and uncharge particles |
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| elements with more than 92 protons in their nuclei |
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| Exposure of film to measure the approximate radiation exposure of people working with radiation. |
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| instruments that detect radiation by counting electric pulses carried by gas ionized by radiation |
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| convert scintillating light to an electric signal for detecting radiation. |
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