Atomic Theory r.a.f.t.

Democritus

• He was the "Father of Modern Science"

John Dalton

• He studied chemistry, physics and color blindness
• He brought back Democritus's idea of an invisible atom
• Dalton Model: 

J.j. thomson

• He discovered the electron 
• By studying cathode rays using a crooke's tube
• The atoms were divisible
• Thomson Model: 

Ernest rUTHERFORD

• Discovered that most of the mass of an atom is the nucleaus
• Electrons move around the nucleus 
• Rutherford Model: 

Niels Bohr

• His model show that electrons move in a circular orbit
• They move at fixed distances from the nucleus
• Bohr Model: 

Erwin Schrodinger

• He developed a mathematical equation 
• It described the motion of electrons in atoms
• The Electron Cloud Model: 

James Chadwick

• He confirmed the existence of neutrons
• They have no charge
• Atomic nuclei has neutrons and protons
• (Positively charged )^