History of the atoms Flashcards Preview

GCSE AQA chemistry > History of the atoms > Flashcards

Flashcards in History of the atoms Deck (5)
Loading flashcards...
1

John Dalton

start of 19th century

- atoms are described as solid spheres

2

JJ Thompson

1897
- plum pudding model
- positively charged sphere with negative electron in it

3

Ernest Rutherfold

1909
Alpha Scatter Experiment

mass concentrated in the centre

positively charged nucleus

most mass is in the nucleus

atom is mainly empty space

4

Neil Bohr

1911
Electrons are in shells orbiting the nucleus

5

James Chadwick

1940
Discover that there are neutrons in the nucleus