Rutherford's model of an atom

Question 1

Alpha Ray Scattering experiment

Answer 1

• Thin gold foil bombarded with alpha particles
• Gold foil surrounded by ZnS screen to observe fluorescence

Question 2

Observations of Alpha Ray Scattering Experiment

Answer 2

• Most alpha particles go undeflected
• Small fraction deflect in small angles
• Very few (1 in 20,000) bounced back

Question 3

Conclusions

Answer 3

*All +ve charge and mass present in center of atom (nucleus)
*Electrons orbit nucleus in fixed paths (orbits)
*Electrons and nucleus held together by electrostatic force of attraction