organizing the elements (copy)
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6 Terms
1
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atomic mass
the average mass of all the isotopes of that element
2
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periodic table
the arrangement of elements showing the repeating pattern of their properties
3
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chemical symbol
a 1 or 2 letter representation of an element
4
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period
a horizontal row of elements in the periodic table
5
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group
elements in the same vertical column of the periodic table (family)
6
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mendeleeve
the person who made the first periodic table
Note 
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