ATOMIC THEORIES

DEMOCRITUS

• Atomos model
• Adams can not be divided into smaller pieces forever
• There is a small particle that can not be cut
• Adams are always moving
• 470 bce

ARISTOTLE

• 340 bce
• "Earth, wind, fire, water
• Thought atomic theory was wrong
• Everything is made up with the 4 elements

DALTON

• 1801
• Plum pudding model
• Made the first atom with muli elements
• Made the mole
• All madder is Indestructible

JJ THOMSON

• 1900
• Found that an electron is In a atom
• Found that hydrogen is the most expandable gas
• Calculated mass ratio

MILLIKIN

• 1910
• Found the charge of a atom
• Oil drop found the mass of a electron
• All electrons carried the same charge and mass

RUTHERFORD

• The goldfoil experiment
• Found that the nucleus was dence with a positive chage
• Assumed that the electrons are outside the nucleus

BILLIARD

• Ball drop
• Discovered the neutron
• Atomic bomb