Mendeleev periodic table horizontal group
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Mendeleev realized that the physical and chemical properties of elements were related to their atomic mass in a 'periodic' way, and arranged them so that groups of elements with similar properties fell into vertical columns in his table. ... And when they were discovered,Mendeleev turned out to be right.
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There are eight (8) groups in Mendeleev's periodic table.
Those are vertical columns.
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