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6 Cards in this Set
- Front
- Back
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atomic mass
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the average mass of all isoteps of that element.
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periodic table
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an arangement of elements showing the repeating pattern of their properties.
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chemical symbol
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A one or two letter representation of an element.
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periods
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A horizontal row of elements in the periodic table.
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group
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The elements in a column
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atomic number
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The number of protons in the nucleus of an atom
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