Basic Atomic Concepts

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Proton

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A subatomic particle found in the nucleus of every atom. It has a positive electric charge.

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Atomic Mass Unit

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A unit of mass that describes th emass of an atom or molecule

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Neutron

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A subatomic particle that has no charge and that is found in th enucleus of an atom.

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Atomic Number

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The number of protons in the nucleus of an atom; the atomic number is the same for all atoms of an element.

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Isotope

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Same number of protons (same as atomic number), different number of neutrons (causing differences in atomic mass)

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Mass Number

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The total number of protons and neutrons in an atomic nucleus.

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Atomic Mass

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The mass of an atom expressed in atomic mass units.