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    Did Mendeleev base the periodic table on atomic mass or atomic number? I know that now the periodic table is based on atomic number, but was that an alteration after Mendeleev's intial design?
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    (Original post by Shaft)
    Did Mendeleev base the periodic table on atomic mass or atomic number? I know that now the periodic table is based on atomic number, but was that an alteration after Mendeleev's intial design?
    Atomic mass, he didnt know the atomic numbers. But he formed the groups by observing the element's reactions with each other.
 
 
 

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