Electronic Timeline
Published on Nov 29, 2015
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PRESENTATION OUTLINE
DEMOCRITUS
- Said that atoms are uncuttable
- Atoms are small, hard particles
- All substances are made of atoms
- Atoms are constantly moving
DALTON
- Said that atoms of the same element are exactly alike
- Atoms of different elements are different
- Elements combine in specific proportions
- He conducted experiments in combining elements
THOMPSON
- His theory of atomic structure led to the "plum-pudding" model
- He conducted the cathode-ray tube experiment
- He said that there are small, negatively charged particles inside an atom
RUTHERFORD
- He conducted the gold foil experiment
- He said that most of an atom's mass is in the nucleus
- Electrons move in empty space in the atom
- There is a small, dense, positively charged nucleus
- Atoms contain mostly empty space
BOHR
- He said that electrons move in definite paths
- Electrons jump between levels from path to path
MODERN THEORY
- Electron paths cannot be predicted
- Electrons are found in electron clouds, not paths
