1. ernest rutherford discovery of radioactivity 2. james chadwick discovery of the electron 3. henri becquerel discovery of the neutron 4. j. j. thomson discovery of the atomic nucleus

You must match each scientist with its major contribution to science.

Scientist                

1.Ernest Rutherford

2. James Chadwick

3. Henri Becquerel

4. J.J. Thomshon

Contribution

a) Discovery of radiactivity

b) Discovery of the electron

c) Discovery of neutron

d) Discovery of atomic nucleus

Answers

1 - d: Ernest Rutherford discovered the atomic nucleous

This was the result of the experiment of the gold  foil experiment.

2 - c: James Chadwick discovered the neutron

This was in 1932. James Chadwick was a collaborator of Ernest Rutherford.

3 - a: Henri Becquerel discovered the radiactivity.

That is why the unit of radioactivity is called the becquerel.

4 -b: J.J Thompson discovered the electron

J.J Thompson's cathode ray tube experiments led him to conclude the existence of an under atomic particle named the electron

Answer is to avoid experimental error