Any Quote by Theodore William Richards

Probably our atomic weights merely represent a mean value around which the actual atomic weights of the atoms vary within certain narrow limits... when…

— William Crookes

Certain characteristic properties of elements can be foretold from their atomic weights.

— Dmitri Mendeleev

“Those who are unacquainted with the details of scientific investigation have no idea of the amount of labour expended in the determination of those…

— John Tyndall

[John] Dalton was a man of regular habits. For fifty-seven years he walked out of Manchester every day; he measured the rainfall, the temperature-a…

— Jacob Bronowski

Elements which are similar as regards their chemical properties have atomic weights which are either of nearly the same value (eg. Pt, Ir, Os)…

— Dmitri Mendeleev

“The dogma of the impossibility of determining the atomic constitution of substances, which until recently was advocated with such fervor by the most able…

— Wilhelm Korner

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…

— Dmitri Mendeleev

The elements which are the most widely diffused have small atomic weights.

— Dmitri Mendeleev

The magnitude of the atomic weight determines the character of the element, just as the magnitude of the molecule determines the character of a…

— Dmitri Mendeleev

The question whether atoms exist or not... belongs rather to metaphysics. In chemistry we have only to decide whether the assumption of atoms is…

— August Kekule

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

— Dmitri Mendeleev

It is the weight, not numbers of experiments that is to be regarded.

— Isaac Newton