Atoms & The Periodic Table

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Atomic Number

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

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Electron

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A negatively charged subatomic particle that orbits the nucleus of an atom.

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Protons

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Positively charged subatomic particles found in the nucleus of an atom.

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Nucleus

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

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Chemical Element

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A pure substance consisting of only one type of atom.

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Subatomic Particles

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Particles smaller than an atom, including protons, neutrons, and electrons.

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Outer Shell

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The outermost electron shell of an atom.

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Periodic Table

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A table of the chemical elements arranged by atomic number.

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Electrons

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Negatively charged subatomic particles that orbit the nucleus of an atom.

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Group

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A column in the periodic table that contains elements with similar chemical properties.