7th Grade Science Mid-Term Exam Vocabulary

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atom

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the smallest particle of an element

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chemical formula

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represents the type and number of atoms present in a particular substance

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molecule

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formed when two or more atoms combine chemically

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compound

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composed of two or more different elements that are chemically combined

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element

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a pure substance composed of the same type of atom throughout

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particle

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a portion of matter

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Periodic Table of Elements

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chemical elements organized by increasing atomic number

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Mixture

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a substance made by mixing other substances together

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Subscript

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a small number that appears to the bottom right of a chemical symbol in a chemical formula

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Pure Substance

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substances that are made up of only one kind of particle and have a fixed or constant structure