John Dalton

By: Ryan and Liz

John Dalton's 5 Ideas About the Atom

1) All matter is made of atoms. Atoms are indivisible and indestructible.

2) All atoms of a given element are identical in mass and properties.

3) Compounds are formed by a combination of two or more different kinds of atoms.

4) A chemical reaction is a rearrangement of atoms.

5) Atoms cannot be created or destroyed

Drawbacks in Dalton's Theory

1) Atoms can actually be destroyed by nuclear reactions, but not by chemical reactions. Also, they can be subdivided into Protons, Neutrons, and Electrons.

2) 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.

John Dalton

John Dalton (6 September 1766 – 27 July 1844) was an English chemist, meteorologist and physicist. He is best known for his pioneering work in the development of modern atomic theory.