“Elements which are similar as regards their chemical properties have atomic weights which are either of nearly the same value (eg. Pt, Ir, Os) or which increase regularly (eg. K, Ru, Cs).”
Other Dmitri Mendeleev Quotes
The magnitude of the atomic weight determines the character of the element, just as the magnitude of the molecule determines the character of a compound body.
Dmitri Mendeleev 
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No law of nature, however general, has been established all at once; its recognition has always been preceded by many presentiments.
Dmitri Mendeleev
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Pleasures flit by - they are only for yourself; work leaves a mark of long-lasting joy, work is for others.
Dmitri Mendeleev
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There exists everywhere a medium in things, determined by equilibrium.
Dmitri Mendeleev
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