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a specific kind of matter with constant properties.

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a stable subatomic particle that is in all atomic nuclei.

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an element or substance that is not metal.

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a subatomic particle about the same mass as a proton but without an electric charge. it is in all atomic nuclei except the ones with ordinary hydrogen.

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a combination of two or more chemicals.

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a type chemical element that has properties in between/a mixture of metals and non-metals.

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any chemical element that can be a conductor of electricity and heat can be defined as a metal.

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the total number of protons and neutrons in a nucleus.

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a copy(s) of the same element that has an equal number of protons but an unbalanced number of nutrons. this gives them a difference in atomic mass.

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a pure substance on the periodic table.

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an informal physics term that is used to describe where electrons are when they go around the nucleus of an atom

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a stable particle with negative electricity

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a mixture of two or more elements.

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the amount of of protons in the nucleus of an atom that determines the place that the element belongs on the periodic table.

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the mass of a chemical element shown in atomic mass units.