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| formed when two or more substances are put together but are not chemically combined |
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| an uncharged subatomic particle contained within the nucleus of an atom; similar in mass to a proton |
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| the dense centre of an atom; part of an atom containing all of the positive charge and almost all of the mass of the atom |
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| two electrons together in an electron shell |
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| a property of a substance that can be observed through the senses, measured, or calculated |
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| a positively charged subatomic particle contained within the nucleus of an atom; has an electric charge of +1; stable when outside of the nucleus |
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| a substance that has identical properties in every sample; also called a substance |
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| particle any of the parts that make up the atom; includes electrons, protons, and neutrons |
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| a single electron in an electron shell |
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