plum pudding

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In 1804, John Dalton agreed with Democritus that matter was made up of tiny spheres...
(atoms) that could be broken up
1 of 8
100 years later, JJ Thompson discovered that electrons...
could be removed from atoms
2 of 8
Thompson suggested that the atoms were spheres of positive charge with...
tiny negative electrons stuck in them
3 of 8
In 1909, Rutherford and Marsden tried firing a beam of alpha particles at...
thin gold foil
4 of 8
They expected the positively charged alpha particles to be slightly deflected by...
the electrons in the plum pudding mode
5 of 8
However, most of the alpha particles just went straight through, but...
the odd one came straight back at them
6 of 8
They also realised that the nucleus must have a positive charge...
since it repelled the positive alpha particles
7 of 8
It also showed that most of the atom was just...
empty space
8 of 8

Other cards in this set

Card 2

Front

could be removed from atoms

Back

100 years later, JJ Thompson discovered that electrons...

Card 3

Front

tiny negative electrons stuck in them

Back

Preview of the back of card 3

Card 4

Front

thin gold foil

Back

Preview of the back of card 4

Card 5

Front

the electrons in the plum pudding mode

Back

Preview of the back of card 5
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