 Early speculations about the nature of the chemical bond, from as early as the 12th century, supposed that certain types of chemical species were joined by a type of chemical affinity.In 1704, Sir Isaac Newton famously outlined his atomic bonding theory, in "Query 31" of his "Opticks", whereby atoms attach to each other by some "force".Specifically, after acknowledging the various popular theories in vogue at the time, of how atoms were reasoned to attach to each other, i.e.