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15 Cards in this Set
- Front
- Back
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The number of protons in the nucleus of an atom
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Atomic number
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A negatively charged particle with an extremely small mass.
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Electron
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A region in an atom that contains electrons of a certain energy.
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Energy levels
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The splitting of a nucleus.
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Fission
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The joining together of smaller nuclei into a larger one.
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Fusion
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The time required for half the nuclei in a sample of a specific isotopic species to undergo radioactive decay.
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Half-life
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Different forms of the same element that have different numbers of neutrons; one of two or more atoms having the same atomic number but different mass numbers.
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Isotopes
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Each compound is always made of the same elements combined in the same proportion by mass.
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Law of the definite proportions
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The sum of the number of protons and neutrons in the nucleus of an atom; also known as the atomic mass.
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Mass number
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A neutral particle in the nucleus of an atom, with approximately the same mass as a proton.
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Neutrons
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The center of an atom, which contains protons and neutrons.
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Nucleus
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Regions of the most probable location of electrons.
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Orbitals
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A positively charged particle in the nucleus of an atom; 1836 times heavier than an electron.
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Protons
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A term describing the ability or tendency to emit nuclear decay particles and rays.
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Radioactive
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The process of emitting radiation from a radioactive nucleus; the emission of rays and particles from an unstable nucleus.
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Radioactivity
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