Evolution of the theory of the atom

Question 1

Plum pudding model

Answer 1

A large cloud of positive charge with lots of negative electrons dotted throughout

Question 2

Alpha particle scattering experiment

Answer 2

Rutherford and Marsden did an experiment to test the plum pudding model, they fired positively charge alpha particles at this thin sheet of gold foil. Most went straight through, some got deflected a little bit and some got deflected a lot. This suggested that there was a small centre that was positive surrounded by negative, this led to the development of the nuclear model by Bohr that we use today.

Question 3

Rutherford

Answer 3

responsible for discovery of the nucleus of protons

Question 4

Chadwick

Answer 4

discovered neutrons

Question 5

Bohr

Answer 5

Developed current model

Question 6

Dalton

Answer 6

1800’s solid sphere

Question 7

JJ Thompson

Answer 7

1897 plum pudding model

Question 8

Order of events

Answer 8

John Dalton, JJ Thompson, alpha particle scattering experiment, Rutherford’s nuclear model, Bohr’s nucleur model, James Chadwick