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GCSE AQA chemistry > History of the atoms > Flashcards

History of the atoms Flashcards

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1
Q

John Dalton

A

start of 19th century

  • atoms are described as solid spheres
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2
Q

JJ Thompson

A

1897

  • plum pudding model
  • positively charged sphere with negative electron in it
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3
Q

Ernest Rutherfold

A

1909
Alpha Scatter Experiment

mass concentrated in the centre

positively charged nucleus

most mass is in the nucleus

atom is mainly empty space

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4
Q

Neil Bohr

A

1911

Electrons are in shells orbiting the nucleus

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5
Q

James Chadwick

A

1940

Discover that there are neutrons in the nucleus

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GCSE AQA chemistry (2 decks)

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