The History of the Atom

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Dalton's theory
All matter is made of atoms Atoms cannot be broken down into anything simpler All the atoms of a particular element are identical to each other and different from the atoms of other elements Atoms are rearranged in a chemical reaction Compounds are f
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JJ Thompson's
JJ Thompson discovered the electron in 1897. This showed that the atom contained smaller pieces, whereas Dalton had thought that atoms could not be broken down into anything simpler.
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Rutherford's nuclear atom
In 1911 Ernest Rutherford used experimental evidence to show that an atom must contain a central nucleus. This was further evidence that an atom contained smaller pieces.
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Bohr's electron orbits
Niels Bohr further developed Rutherford's nuclear atom model. He used experimental evidence to support the idea that electrons occupy particular orbits or shells around the nucleus of an atom.
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James Dalton
Discovered the electrons.
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Other cards in this set

Card 2

Front

JJ Thompson discovered the electron in 1897. This showed that the atom contained smaller pieces, whereas Dalton had thought that atoms could not be broken down into anything simpler.

Back

JJ Thompson's

Card 3

Front

In 1911 Ernest Rutherford used experimental evidence to show that an atom must contain a central nucleus. This was further evidence that an atom contained smaller pieces.

Back

Preview of the back of card 3

Card 4

Front

Niels Bohr further developed Rutherford's nuclear atom model. He used experimental evidence to support the idea that electrons occupy particular orbits or shells around the nucleus of an atom.

Back

Preview of the back of card 4

Card 5

Front

Discovered the electrons.

Back

Preview of the back of card 5

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