What does it mean when atoms are sticking to each other ?
In 1826 , building on the work of Avogadro , the French chemist Jean - Baptiste Dumas states:In coordination with these concepts , in 1833 the French chemist Marc Antoine Auguste Gaudin presented a clear account of Avogadro 's hypothesis , regarding atomic weights , by making use of “ volume diagrams ” , which clearly show both semi-correct molecular geometries , such as a linear water molecule , and correct molecular formulas , such as H2O:In two papers outlining his " theory of atomicity of the elements " ( 1857–58 ) , Friedrich August Kekulé was the first to offer a theory of how every atom in an organic molecule was bonded to every other atom .