Models of the Atom Humans Try Lots Of Ideas. A Greek philosopher, Democritus, lived about 2500 years...
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Transcript of Models of the Atom Humans Try Lots Of Ideas. A Greek philosopher, Democritus, lived about 2500 years...
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Models of the Atom
Humans Try Lots Of Ideas
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A Greek philosopher, Democritus, lived about 2500 years ago.
He suggested that matter cannot be divided indefinitely, but must have a smallest entity.
He called this smallest entity the ATOM.
ATOMA = indivisible
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Dalton
• Took Democritus’s theory and added scientific data
• An element is composed of the same atoms
• All elements are made out of different atoms
• Each type of atom has a certain mass, size and chemical behavior
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J.J. Thompson: Found the Electron
Before the discovery of the nucleus. The main part of the atom had a positive charge and then there were negative charges scattered throughout
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The “Marsden” Experiment
Ernest Rutherford
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Difference between Plum Pudding and the Rutherford Model
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Neils Bohr
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Light can excite electrons around atoms and this gives rise to “quantum levels”.
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Prince Louis' full name is Louis Victor Pierre Raymond duc de Broglie
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