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Newlands
________: grouped elements based on atomic masses into octaves (rows of 8)
Dobereiner
________: grouped elements into triads based on like properties (gas, liquid, solid)
Mendeleev
________: based his arrangement on atomic mass and columns with similar properties.
Dobereiner
grouped elements into triads based on like properties (gas, liquid, solid)
Newlands
grouped elements based on atomic masses into octaves (rows of 8)
Mendeleev
based his arrangement on atomic mass and columns with similar properties
Moseley
based his arrangement on atomic number
Note 
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