1. Who proposed the plum pudding model of the atom?

a) Ernest Rutherford
b) Niels Bohr
c) J. J Thomson
d) James Chadwick

2. What charge did Thomson suggest the "pudding" had in his plum pudding model of the atom?

a) Positive
b) Negative

3. What type of particles did Ernest Rutherford fire at a thin layer of gold foil?

a) Neutrons
b) Electrons
c) Protons
d) Alpha particles

4. What charge is present on an alpha particle?

a) 1+
b) 2+
c) 1-
d) 2-

5. Alpha particles consist of two positively charged and two neutral .

6. Rutherford's gold foil experiment was carried out in a to stop the alpha particles from colliding with the particles present in the air.

7. What did Rutherford expect to happen to most of the alpha particles?

a) Bounce straight back from the gold foil
b) Be deflected at large angles when they near the gold foil
c) Pass straight through the gold foil
d) Be absorbed by the gold foil

8. What was used to detect the alpha particles in Rutherford's experiment?

a) A fluorescent screen
b) A high powered microscope
c) A Geiger counter
d) A focussed laser beam

9. Following his scattering experiment Rutherford concluded that atoms consist of a small central which has a charge.

10. Which scientist proposed the idea of electron shells or energy levels?

a) Ernest Rutherford
b) Niels Bohr
c) J. J Thomson
d) James Chadwick