Atoms Flashcards

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Atom

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The smallest unit of matter that retains the properties of an element.

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Element

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A pure substance made up of only one kind of atom.

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Proton

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

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Neutron

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

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Electron

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A negatively charged particle found outside the nucleus of an atom.

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Atomic Number

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The number of protons in an atom’s nucleus, which identifies the element.

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Mass Number

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The total number of protons and neutrons in an atom’s nucleus.

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Periodic Table

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A chart that organizes all the known elements by their atomic number and properties.