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Models of the Atom Humans Try Lots Of Ideas. A Greek philosopher, Democritus, lived about 2500 years ago. He suggested that matter cannot be divided indefinitely,

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Presentation on theme: "Models of the Atom Humans Try Lots Of Ideas. A Greek philosopher, Democritus, lived about 2500 years ago. He suggested that matter cannot be divided indefinitely,"— Presentation transcript:

1 Models of the Atom Humans Try Lots Of Ideas

2 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

3 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

4 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

5 The “Marsden” Experiment Ernest Rutherford

6 Difference between Plum Pudding and the Rutherford Model

7 Neils Bohr

8 Light can excite electrons around atoms and this gives rise to “quantum levels”.

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10 Prince Louis' full name is Louis Victor Pierre Raymond duc de Broglie

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12 Mendeleev's Periodic Table of

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