Atomic theory R.A.F.t

Democritus

• used philosophy, not science
• Atoms were indivisible and indestructible
• Everything is made up of atoms

John Dalton

• He was a British chemist
• Identified the red-green color blindness
• First to explain atoms measurments and weight

J.J. Thomson

• A British scientist
• Discovered the electron
• Pictured electrons embedded in a sphere with positive charge

Ernest Rutherford

• A New Zealand physicist
• Identifies the characteristics of a nucleus
• An atom has a small, dense nucleus that is positively charged

Neils Bohr

• A Danish physicist
• Understood atomic structure and quantum theory
• The electron moves in a circular orbit 

ERwin Schrodinger

• An Austrian physicist
• Developed equations to describe motion of electrons
• his work lead to the electron cloud model

James chadwick

• An English physicist
• Confirmed the existence of neutrons that have no charge
• The atomic nuclei have neutrons and positive charged protons