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    your help is needed please


    dimitri mendeleev


    vs



    john newman



    what was john newman ideo about how he could construct the elements ina logical order and the differences to that of how mendeleev did for his theory to get accepted eventually?

    thank you
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    (Original post by haemo)
    Newlands:

    Arranged elements in order of increasing relative atomic mass
    Elements were put into octaves (groups of eight)
    Every eighth element across a period had a similar chemical property when going down the group of each eighth element


    Mendeleev:

    Arranged elements in order of increasing relative atomic mass
    Elements were put into groups with similar chemical properties
    Left gaps in the periodic table for future elements by predicting their chemical properties (point above)

    Thank you
    and also i found out that Mendeleev ordered them inorder of mass number
    but we changed it to inorder of increasing atomic numbers
 
 
 
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