ATOMS

DEMOCRITUS

ATOMOS

• 450 BC is when he started.
• you can get something so small it can't be split up anymore

ARISTOTLE

5TH ELEMENT

• He cam up with the idea of a 5th element
• He thought it was called aether
• He also predicted it only existed in stars

DALTON

BILLIARD BALL

• He suggest that atoms reassemble billiard balls
• Small, solid, and indestructible

J.J. THOMSON

PLUM PUDDING

• He said pudding itself is positively charged
• And the plums dotting it are negative electrons

RUTHERFORD

GOLD FOIL

• He thought space around atoms were empty
• He shot a negatively charged laser at foil
• When some laser bounced back he made a prediction
• There are small positively charge pd electrons around atoms

MILIKAN

OIL DROP

• He dropped oil through a magnetic feild
• They turned to mist and went into the next floor of the chamber
• He then studied the electrons attach themselves to the oil.

CHADWICK

PLANETARY MODEL

• He made model of an atom like Rutherford
• His had the nucleus, protons, neutrons, and electrons