Basic Chemistry Concepts

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Atom

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Smallest particle of an element

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Nucleus

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Center 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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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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Electron

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A subatomic particle that has a negative charge that orbits the nucleus

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Element

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A pure substance made of only one kind of atom

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Atomic Number

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The number of protons in the nucleus of an atom

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Atomic Mass

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It is approximately equivalent to the number of protons and neutrons in the atom

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Periodic Table of Elements

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A table that classifies elements by their physical and chemical properties; rows are called periods; columns are called groups

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Mendeleev

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Proposed 1st periodic table where elements were arranged according to Atomic Mass