In simple terms, that assertion is correct, but for those with an expertise in the field, the longer answer to who did it ...

Matter and its nature, Dalton's atomic theory, Concept of atom, molecule, element and compound, Laws of chemical combination, Atomic and molecular masses, mole concept, molar mass, percentage ...

John Dalton was born in 1766 in Cumbria, and worked for most of his life in Manchester. His achievements include: Developing atomic theory. This states that everything is made up of tiny particles ...

BBC Bitesize A simple model of an atom shows a nucleus orbited by a number of electrons In 1803, John Dalton's atomic theory brought them into scientific view, but the Manchester scientist was ...