MadSci Network: Chemistry

Re: Why did Mendeleev list atomic weights instead of atomic numbers?

Date: Sat Mar 21 14:38:57 2009
Posted By: Ara Kooser, Grad Student
Area of science: Chemistry
ID: 1236753209.Ch

I believe at the time most elements were characterized by their physical properties and actually weight. So when people were working on arranging the elements atomic numbers were not used. At the time when Mendeleev was working at the atomic numbers were not known or suspected.

A Brief History of the Periodic Table

Early attempt at arranging elements:
On the Relationship of the Properties of the Elements to their Atomic Weights:

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