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15 Cards in this Set
- Front
- Back
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Atom
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the basic unit of matter
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Atomic Number
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the number of protons in the nucleus of an atom
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Electron
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a negatively charged particle that moves around the nucleus
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Electron dot diagram
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a diagram that shows the element symbol surrounded by dots
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Element
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a pure substance that cannot be broken down into simpler substances by ordinary chemical means
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Energy Level
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a particular region where electrons can orbit a nucleus
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Ion
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an atom that has an electrical charge because it has gained or lost electrons
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Isotope
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one of several forms of the same element
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Mass Number
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the number of protons plus neutrons in the nucleus of an atom
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Neutron
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a particle with no charge located in the nucleus of an atom
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Nucleus
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the positively charged, dense center of an atom
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Periodic Table
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a chart that organizes the chemical elements based on their properties
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Proton
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a positively charged particle located in the nucleus of an atom
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Radioactive
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capable of releasing radiation
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Valence Electrons
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electrons found in the outermost energy level of an atom
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