Atomic Theory
Published on Nov 21, 2015
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PRESENTATION OUTLINE
HIS THOUGHTS...
- Atomos Model
- "Atomos" refers to the smallest piece of matter that is indivisible.
- He believed that atoms were small, but had different shapes and sizes.
- The atom is the smallest particle.
HIS THOUGHTS...
- Aristotle believed everything was made up of elements
- Fire, Water, Earth, Air
- His theory was incorrect
- His theory was thought to be true for more than 2000 years
JOHN DALTON
1803
HIS THOUGHTS...
- Billiard Ball Model
- All matter is made up of atoms
- Not fire, earth, water, air
- Atoms can't be created or destroyed
JJ THOMSON
1896
HIS THOUGHTS...
- Cathode Ray Experiment
- "Plum Pudding" Model
- Negative particles (electron) inside positive sphere
ROBERT MILLIKAN
1909
HIS THOUGHTS...
- Oil Drop Experiment
- Determined mass and charge of an electron
- His experiment proved that Thomson's hypothesis was correct
- The mass of an electron is at least 1000 times smaller than the smallest atom
ERNST RUTHERFORD
1911
HIS THOUGHTS...
- Gold Foil Experiment
- Positively Charged Nucleus Model
- Discovered the nucleus is positively charged
- Negative electrons surround the nucleus
JAMES CHADWICK
1932
HIS THOUGHTS...
- Proton Neutron Model
- Proved neutrons exist inside nucleus
- Atomic number is determined by number of protons
