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10 Cards in this Set
- Front
- Back
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Proton
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positively charged particles found within atomic nuclei
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Electron
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negatively charged particles that surround the atom's nucleus.
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Neutron
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uncharged particles found within atomic nuclei
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Atomic Number
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the number of protons in an atom's nucleus
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Mass Number
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the sum of the number of neutrons and protons in an atomic nucleus
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Isotopes
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an atom is missing a neutron or has an extra neutron
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Energy Levels
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the possible energies that electrons in an atom can have
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Electron cloud
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a visual model of the most likely locations for the electrons in an atom
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Period
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a row in the periodic table of elements
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Group
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a column of elements in the periodic table
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