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

There is nothing in this world that I fear to say.
Dmitri Mendeleev

It is the function of science to discover the existence of a general reign of order in nature and to find the causes governing this order. And this refers in equal measure to the relations of man - social and political - and to the entire universe as a whole.
Dmitri Mendeleev

The establishment of a law, moreover, does not take place when the first thought of it takes form, or even when its significance is recognised, but only when it has been confirmed by the results of the experiment.
Dmitri Mendeleev

We could live at the present day without a Plato, but a double number of Newtons is required to discover the secrets of nature, and to bring life into harmony with the laws of nature.
Dmitri Mendeleev

No one nor anything can silence me.
Dmitri Mendeleev

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).
Dmitri Mendeleev

The elements, if arranged according to their atomic weights, exhibit an apparent periodicity of properties.
Dmitri Mendeleev