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A group of atoms held together by covalent bonds is a ____.
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anion
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A ____ is a subatomic particle with no electric charge.
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atom
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The basic unit of an element is an ____.
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catalyst
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A ____ is subatomic particle with a positive charge.
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compound
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An ____ consists of only one type of atom.
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element
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A ____ contains atoms of at least two different elements.
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molecule
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A negatively charged ion is called an ____.
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neutron
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A ____ increases the rate of a chemical reaction.
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proton
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