ATOMIC PROGRESSION

DEMOCRITUS

ATOMOS MODEL

• Figured out all things are made of tiny things.
• All things have a common matter.
• Atoms mean invisible.

ARISTOTLE

FIRE WATER EARTH AIR

• Discovered the Four main elements

DALTON

BILLIARD BALL MODEL

• Proved atoms are invisible and have density
• First say elements have a unique
• Elements can't be created or destroyed

J.J. TOMSON

PLUM PUDDING MODEL

• Cathdoe ray made the normally invisible magnetic field visible
• Found electrons floating around the protons

MILLIKIN

CHARGE OF A ELECTRON

• Used the oil drop method to determine the charge of a electron
• Discovered the electron has a negative charge

RUTHERFORD

POSITIVELY CHARGED NEUCLUS

• Shot Alpha particles gold foil, some bounced back
• Discovered positively charged nucleus

CHADWICK

PROTON NEUTRON MODEL

• Created a rough model of the Atom
• Discovered neutral particles in the center of the atom