History of the atom Flashcards
1
Q
john dalton discovery
A
tiny spheres, certain element all identical, combine to make compounds
2
Q
JJ thompson
A
plum pudding model, electron, ball of positive charge
3
Q
Geiger and marsden experiment
A
fired alpha particles at gold expecting to pass through but they didn’t
4
Q
geiger and marsden results
A
some travelled straight through - empty space
some deflected - nucleus with positive charge
some bounced back - small nucleus , lots of mass, in the centre
5
Q
ernest rutherford
A
new model solid positively charged centre ( the nucleus ) , negative electrons in orbit around it
6
Q
Niels Bohr
A
electrons orbit the nucleus at a set distance called shells
7
Q
James Chadwick
A
third particle called a neutron found in the nucleus
