Atoms, Elements, and Compounds S8P1 a. and e.

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Element

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substance made of one type of atom

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Compound

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formed by two or more elements chemically combined

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Pure substance

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a form of matter with uniform and definite composition. This can be an element or compound.

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Proton

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a positively charged particle in atom’s nucleus

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Neutron

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a neutrally charged particle in atom’s nucleus

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Electron

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a negatively charged particle outside nucleus

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Nucleus of an atom

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the center of an atom that contains protons and neutrons

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List of common compounds

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Identify pure substances

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Describe protons’ role

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atomic number and identity of element