1. What is the structure of an atom and what is an isotope?
Atomic Structure
What is the structure of an atom and what is an isotope?
Starter: Complete the card sort on atoms and then use the plastercine to make a model of what you think an atom looks like.

2. What is the structure of an atom and what is an isotope?
Atomic Structure
What is the structure of an atom and what is an isotope?
Starter: Complete the card sort on atoms and atomic structure.

3. Learning Outcomes
describe the Rutherford–Geiger–Marsden alpha particle and gold foil scattering experiment
explain that the results show the atom has a small, massive, positively charged nucleus
explain that the nuclear model was thought up creatively to account for the data

4. Atomic structure
Atomic Structure

5. Atomic structure
Atomic Structure

6. Atomic Information
Pick 1 element and work out the number of protons Neutrons Electrons

7. Task: complete the worksheet filling in the data.

8. How do we know all this info?
Rutherford–Geiger–Marsden alpha particle and gold foil scattering experiment gave us the clues and they used the data to produce a model of an atom.

9. Check point Which 2 parts of the atom are found in the nucleus ?1 2 3
Electron and neutron
Electron and Proton
Proton and neutron

10. Lets investigate
Try the scatter experiment.

11. Rutherford’s experiment
Rutherford’s experiment. An alpha particle striking the detecting material gives a tiny flash of light.

12. The equipment

13. Most of the alpha particles passed straight through the gold foil, deflected by no more than a few degrees.
A few of the alpha particles were actually reflected back towards the direction from which they had come.

14. Structure of an Atom- Evidence for
Rutherford fired positively charged particles at thin gold foil
Nearly all went straight through Au
Some were deflected
Some bounced back
DISCUSS :
Can you explain how the experiment proves this model of an atom?
ELECTRONS
PROTONS
NEUTRONS

15. The observations
Why have these deflections been observed?

16. Conclusions Evidence Conclusion
Most alpha particles went straight through
A few were deflected at small angles (90)
Very few (1 in 10,000) were deflected at large angles (>90)

17. Plenary
Describe an atom as clearly and concisely as possible, in 2 sentences.
Proton
Neutron
Electron
Nucleus
Charge

18. Complete the GCSE question