SCIENTISTS

DEMOCRITUS

• He had his theory around 460 BC
• He had no experiments

ATOMS MODEL

• Invisible atoms
• They differ in shape,size,mass,position,and arrangement
• Industitable
• Solid

ARISTOTLE

• His theory was in 1811
• No experiments

EARTH,WIND,FIRE,WATER

• Earth is round
• 22 countering spheres on the systmem
• Aerther main component of heaving bodies

JOHN DALTON

• He did a famous experient in 1803
• Its known as the Billiard Ball Experiment

BILLIARD BALL MODEL

• Cant break apart
• Cant break break them down
• Atoms dont get destroyed they get arranged

THOMSON

• He discovered the Plum Pudding Model in 1897
• He did the Cathode Ray Experiment

PLUM PUDDING MODEL

• Positive and negitive charge
• Negitives are small
• Positive and negitive filling

RUTHERFORD

• Did an experiment in 1911
• Known as the Gold Foil Experiment

POSITIVLY CHARGED NUCLEUS

• Atoms are 99.99% empty space
• Some particals get deflected
• Few get bounced off the foil

MILIKAN

• Known from experiment in 1913
• Famous for the Oil Drop Experiment

MASS/CHARGE OF AN ELECTRON

• Measured charge of electrons
• Calculated by Q=MxG/E
• Single electron was 1.6x10^-19

CHADWICK

• Known for his theory in 1932
• Its known as the Proton Nucleus Theory

PROTON NUCLEUS

• Atoms have a neutron
• Made the atomic number
• The atomic number is made of protons in an atom