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12 Cards in this Set
- Front
- Back
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matter
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anything that has mass and takes up space.
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element
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a substance that cannot be broken downinto any other substances by a chemical or physical means.
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compound
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A substance made of two or more elements chemically combined in a specific ratio or porportion.
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mixture
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two or more substances that are mixed together but no chemically combined.
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atom
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the smallest particle of an element
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scientific theory
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a well tested idea that explains and connects a wide range of observations.
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model
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a physical mental visual and othe representaions of an idea to help people understand a concept they cannot observe directly.
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electrons
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Negatively charged particles that move outside the neucleus of an atom.
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nucleus
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The central core of the atom containing protons and usually neutrons.
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protons
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small positively charged particles that are found in the neucleus of an atom.
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energy level
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The specific amount of enegy an electron has.
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neutrons
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small uncharged particles that are foundin the neucleus of an atom.
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