The Atomic Theory In this report I will give a history on the development of the atomic theory. I will cover some of the most important dates in the development of atomic theory. An atom was first thought of by the Ancient Greeks who believed that matter was made of smaller particles called elements. The name they gave to these particles was the atom. In 1776 the man known as "The Father of Atomic Theory", John Dalton was born in England. He is known as the father of atomic theory because he is the one who discovered many of the different masses for different elements, he also discovered the different proportions which molecules are formed in. Da