John Dalton John Dalton’s major contribution was his theory on atoms which consists of five parts as follows:- Atoms are made of tiny particles known as atoms. Atoms are indivisible and indestructible. Atoms of a given element are identical in size, mass, and chemical properties. In a chemical reaction, atoms separate, combine and rearrange. Dalton made a lot of discoveries based on his observations. John Dalton FRS was an English chemist, physicist and meteorologist. He is best known for introducing the atomic theory into chemistry. And for his research into colour blindness, which he had. Colour blindness is known as Daltonism in several languages, being named after him.
