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Models of the Atom

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Clinton Owner

on 15 October 2015

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Transcript of Models of the Atom

1500
1900
2000
500BCE
1950
Models of the Atom
Democritus (~400 BC)
Philosopher - deduced that everything is made of either tiny, indestructible atoms or void (nothingness)
John Dalton (~1830)
Atomic Model: Tiny spheres of different sizes
Atoms cannot be broken, created or destroyed
Compounds are made of atoms in fixed, whole number ratios
J.J. Thomson (1890's)
Discoverer of the electron
Ernest Rutherford (~1910)
Gold Foil Experiment
Niels Bohr (~1915)
Solar system model


Energy levels or shells
Erwin Schrodinger
Electron clouds


Locations of electrons predicted by probabilities

Electrons behave as both particles and waves
0CE
1800
For example
water molecule (H O) =
1 oxygen + 2 hydrogen
2
Plum Pudding model
Full transcript