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).
More Quotes from Dmitri Mendeleev:
The elements which are the most widely diffused have small atomic weights.Dmitri Mendeleev
Pleasures flit by - they are only for yourself; work leaves a mark of long-lasting joy, work is for others.
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I have achieved an inner freedom.
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I want you to have this feeling too - it is my moral responsibility to help you achieve this inner freedom.
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There exists everywhere a medium in things, determined by equilibrium.
Dmitri Mendeleev
We must expect the discovery of many as yet unknown elements-for example, elements analogous to aluminum and silicon- whose atomic weight would be between 65 and 75.
Dmitri Mendeleev
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