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S.MORRIS 2006…read more

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HISTORY OF THE ATOM
460 BC Democritus develops the idea of atoms
he pounded up materials in his pestle and
mortar until he had reduced them to smaller
and smaller particles which he called
ATOMA
(greek for indivisible)…read more

Slide 3

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HISTORY OF THE ATOM
1808 John Dalton
suggested that all matter was made up of tiny
spheres that were able to bounce around with
perfect elasticity and called them
ATOMS…read more

Slide 4

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HISTORY OF THE ATOM
1898 Joseph John Thompson
found that atoms could sometimes eject a far
smaller negative particle which he called an
ELECTRON…read more

Slide 5

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HISTORY OF THE ATOM
1904
Thompson develops the idea that an atom was made up of
electrons scattered unevenly within an elastic sphere surrounded
by a soup of positive charge to balance the electron's charge
like plums surrounded by pudding.
PLUM PUDDING
MODEL…read more

Slide 6

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HISTORY OF THE ATOM
1910 Ernest Rutherford
oversaw Geiger and Marsden carrying out his
famous experiment.
they fired Helium nuclei at a piece of gold foil
which was only a few atoms thick.
they found that although most of them passed
through. About 1 in 10,000 hit…read more

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