Authors:

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 Ivanovich Mendeleev (2013). “Mendeleev on the Periodic Law: Selected Writings, 1869 - 1905”, p.175, Courier Corporation
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.