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| Anything that has mass and takes up space. |
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| The simplest pure substances, and they cannot be broken down into any other substances. |
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| A pure substance made of two or more elements that are combined chemically in a specific ratio. |
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| The smallest particle of an element. |
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| A well-tested idea that explains and connects a wide range of observations. |
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| Negatively charged particles that move around outside the nucleus of an atom. |
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| The central core of the atom, containing protons and usually protons. |
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| Small, positively charged particles that are found in the nucleus of an atom. |
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| A region of an atom in which electrons of the same energy are likely to be found. |
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