Ch. 3 Vocab

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Atomic Mass

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the average mass of one atom of an element

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Periodic Table

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A table of the chemical elements arranged in order of atomic number.

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Nucleus

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The central part of an atom, containing protons and neutrons.

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Proton

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A subatomic particle found in the nucleus of an atom, with a positive electric charge.

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Neutron

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A subatomic particle found in the nucleus of an atom, with no electric charge.

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Electron

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A subatomic particle with a negative electric charge, orbiting the nucleus of an atom.

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Atomic Mass Unit

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A unit of mass used to express the mass of particles in atoms; a proton or neutron has a mass of 1 amu

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Atomic Number

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The number of protons in the nucleus of an atom, determining the element's identity.

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Chemical Symbol

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A one or two-letter abbreviation for a chemical element.

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Group

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A vertical column of elements in the periodic table with similar properties.