Development Of The Nuclear Model

Question 1

John Dalton

Answer 1

Early 1800s.
Proposed atoms are tiny invisible spheres.

Question 2

J.J. Thomson

Answer 2

1897.
Balls of positive charge with embedded negative charge.
Discovery of the electron.
Called the plum pudding model.

Question 3

Ernest Rutherford

Answer 3

1909.
Fired alpha particles at the atom.
Should have gone straight through but bounced back.
So created the nuclear model.

Question 4

Neils Bohr

Answer 4

1913.
Discovered energy shells.

Question 5

Ernest Rutherford

Answer 5

1917.
Discovers protons by realising the overall positive charge of a neutron can be divided into smaller particles.

Question 6

James Chadwick

Answer 6

1932.
Discovered the neutron.