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4 Cards in this Set
- Front
- Back
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atom
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A unit of matter, the smallest unit of an element, having all the characteristics of that element and consisting of a dense, central, positively charged nucleus surrounded by a system of electrons.
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element
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A substance composed of atoms having an identical number of protons in each nucleus.
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nucleus
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The positively charged central region of an atom
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electron
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a
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