Mendeleyev S / Mendeleev ( 1834 1907 ) Periodic Table , Original Manuscript Crea ...
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Description: Mendeleyev s / Mendeleev ( 1834 1907 ) Periodic Table , original manuscript created by Russian chemist Dmitri Mendeleev in 1869 . Mendeleyev demonstrated that chemically similar elements appear at regular intervals if the elements are arranged in order by relative atomic mass . He classified the then 60 known elements and left gaps in the table , predicting the existence and properties of several unknown elements later discovered , including gallium and scandium .