organizing the elements
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6 Terms
1
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atomic mass
is the average mass of all the isotopes of that element
2
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periodic table
a table of the chemical elements arranged in order of atomic number, usually in rows
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chemical symbol
contain 1 or 2 letters just below an atomic number
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period
The horizontal rows of the periodic table
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group
a column in the periodic table of the chemical elements
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Mendeleev
Created the first periodic table. Arranged elements by increasing atomic mass
Note 
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