Unit 3 - Vocabulary Flashcards

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Element

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A substance that cannot be broken down into simpler substances

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Compound

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A substance made up of atoms of two or more different elements joined by chemical bonds

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Mixture

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A combination of two or more substances that are not chemically combined

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Molecule

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Two or more atoms held together by chemical bonds

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Atom

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Smallest particle of an element

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Proton

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A subatomic particle that has a positive charge and that is found in the nucleus of an atom

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Neutron

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A subatomic particle that has no charge and that is found in the nucleus of an atom

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Electron

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A subatomic particle that has a negative charge and found orbiting the nucleus

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Lewis Dot Structure

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Diagram of a molecule using dots to represent valence electrons

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Chemical Symbol

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A one or two letter representation of an element