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10 Cards in this Set
- Front
- Back
smallest particle of matter
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atom
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number above chemical symbol to organize the Periodic Table into periods; # protons
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atomic number
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subatomic particle outside the nucleus with a negative charge
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electron
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model that shows an area outside the nucleus where the electrons are
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electron cloud model
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the area outside the nucleus where the electrons orbit
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electron cloud or shell
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the combination of neutrons and protons
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atomic mass
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a subatomic particle with a neutral (0) charge that is inside the nucleus.
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neutron
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the central part of an atom that contains the neutrons and protons.
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nucleus
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a subatomic particle with a positive charge that is inside the nucleus.
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proton
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are on the outermost layer of the cloud (shell) and determine the reactivity of an atom/element.
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valence electron
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