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The basic unit of an element is an ____.
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atom
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A ____ increases the rate of a chemical reaction.
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catalyst
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An ____ is subatomic particle with a negative charge.
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cation
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Any atom or molecule that has a charge is an ____.
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electron
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A positively charged ion is called a ____.
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element
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A ____ is a subatomic particle with no electric charge.
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ion
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An ____ consists of only one type of atom.
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neutron
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A ____ is subatomic particle with a positive charge.
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proton
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