The distiction between atoms and molecules of elements (e.g., H and H2) has been accepted and has led to more consistent atomic and molecular weights. Mendeleev also has published versions of the periodic table (1869-71)
|
| This
simulation begins in the period around 1870 when chemistry is beginning
to be organized.
The concept, introduced by Kekulé
and Couper, of tetravalent carbon atoms capable of linking to each
other has permitted the rise of structural concepts in organic
chemistry. The ability to formulate consistent and reasonable
molecular structures for organic compounds is leading to rapid progress
in that field.
Inorganic chemistry, on the other hand, still is in a confused state because the molecular structures of inorganic compounds still are not clear. |
 |
| Friedrich
August Kekulé
(1829 - 1896) |