ATOMIC THEORY

DEMOCUTRIS

ATOMOS THEORY

• Democritus believed that the atom was the smallest particle of matter

ARISTOTLE

EARTH WIND FIRE WATER ELEMENTS

• According to his theory, each element can be transferred into another
• (Continued) element through the quality they posses in common
• This theory was proven incorrect by scientists

DALTON

BILLIARD BALL MODEL

• His model basically states that you can't divide an atom into smaller pieces

JJ THOMPSON

PLUM PUDDING MODEL

• Thompson believed that a positively charged substance filled atoms

RUTHERFORD

POSITIVELY CHARGED NUCLEUS MODEL

• Rutherford discovered the nucleus
• His model includes a large central nucleus with electrons orbiting

MILLIKAN

MASS/CHARGE OF ELECTRON

• Tested his experiment with the oil drop method

CHADWICK

PROTON NEUTRON MODEL

• Found that the protons are on the outside of nucleus
• (Continued) in their own cloud