Unit 8 Lesson 1 Atomic Theory

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Atom

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the smallest particle of an element that has the properties of that element

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Electron

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A tiny, negatively - charged particle that moves around the outside of the nucleus of an atom.

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Nuclues

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The central core of an atom, which contains protons and neutrons

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Isotope

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 An atom with the same number of protons and a different number of neutrons from other atoms of the same element.

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Proton

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A small positively charged particle that is found in the nucleus of an atom.

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Neutron

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A small particle in a nucleus of an atom, with no electrical charge.

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Atomic Number

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The number of protons in the nucleus of an atom.

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Mass Number

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The sum of protons and neutrons in the nucleus of an atom.

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Atomic Theory

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Grew as a series of models that developed from experimental evidence.

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Atomic Mass

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The average mass of all the isotopes of an element.