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ATOM
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Atoms that have the same number of protons but have different numbers of neutrons.
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ISOTOPE
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The region around the nucleus of an atom where electrons are likely to be found
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ELECTRON CLOUD
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An atom's central region, which is made up of protons and neutrons
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NUCLEUS
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Positively charge particles of the nucleus
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PROTONS
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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 subatomic particle that has a negative charge, and surrounds the nucleus of an atom
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ELECTRON
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A subatomic particle that has no charge and that is located in the nucleus of an atom
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NEUTRON
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A unit of mass that describes the mass of an atom or molecule
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ATOMIC MASS UNIT
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The sum of the numbers of protons and neutrons in the nucleus of an atom
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MASS NUMBER
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Mass of an atom expressed in atomic mass units
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ATOMIC MASS
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The smallest unit of an element that maintains the properties of that element
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