Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. Why might the scientific model of the atom change over time?
   • Due to technological advances.
2. What where the atoms thought to be like before the discovery of the atom?
   • Before the discovery of the electron, atoms were thought to be tiny spheres that could not be divided.
3. What did the discovery of the electron lead to?
   • The discovery of the electron led to the plum pudding model of the atom.
4. What did the plum pudding model suggest?
   • The plum pudding model suggested that the atom is a ball of positive charge with negative electrons embedded in it
5. What did the results from the alpha particle scattering experiment lead to?
   • The results from the alpha Particle scattering experiment led to the conclusion that the mass of an atom was concentrated at the centre (nucleus) and that the nucleus was charged. This nuclear model
6. How did Niel Bohr adapt the nuclear model?
   • Niels Bohr adapted the nuclear model by suggesting that electrons orbit the nucleus at specific distances.
7. What did later experiments on the atom lead to?
   • Later experiments led to the idea that the positive charge of any nucleus could be subdivided into a whole number of smaller Particles, each Particle having the same amount of positive charge. The name proton was given to these Particles.
8. What did the experimental work of James Chadwick provide evidence of?
   • The experimental work of James Chadwick provided the evidence to show the existence of neutrons within the nucleus. This was about 20 years after the nucleus became an accepted scientific idea.
9. Describe why the new evidence from the scattering experiment led to a change in the atomic model.
   • Evidence from the scattering experiment led to a change in the atomic model.
10. What is the difference between the plum pudding model of the atom and the nuclear model of the atom.
    • In the plum pudding model the atom was imagined to be a sphere of positive charge with negatively charged electrons dotted around inside it like plums in a pudding.