text: Democritus first suggested the existence of the atom but it took almost two millennia before the atom was placed on a solid foothold as a fundamental chemical object by John Dalton (1766-1844). Although two centuries old, Dalton's atomic theory remains valid in modern chemical thought.    Dalton's Atomic Theory:\n\n1) All matter is made of atoms. Atoms are indivisible and indestructible.\n\n2) All atoms of a given element are identical in mass and properties\n\n3) Compounds are formed by a combination of two or more different kinds of atoms.\n\n4) A chemical reaction is a rearrangement of atoms. \n \n\n\nModern atomic theory is, of course, a little more involved than Dalton's theory but the essence of Dalton's theory remains valid. Today we know that atoms can be destroyed via nuclear reactions but not by chemical reactions. Also, there are different kinds of atoms (differing by their masses) within an element that are known as "isotopes", but isotopes of an element have the same chemical properties.\n\nMany heretofore unexplained chemical phenomena were quickly explained by Dalton with his theory. Dalton's theory quickly became the theoretical foundation in chemistry.