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Year 10 - Science

Developing a model for atoms

Atomic structure and the periodic table

Unit Summary

This unit covers the atomic model, relative atomic mass, isotopes, and the structure of the modern periodic table. It explains how atomic structure influences element positioning, properties, and reactivity. The focus is on identifying trends and using models to develop scientific explanations.

Lesson Summary

You will learn to describe the structure of atoms, the sub-atomic particles they contain, and developments leading to this model.

Key Notes

  • The atomic model has changed over time.
  • Dalton, Thomson, Rutherford (Geiger and Marsden), Bohr and Chadwick have all suggested atomic models.
  • The plum pudding model of the atom and the nuclear model are two important models in the history of the atom's discovery
  • New evidence from the scattering experiment led to a change in the atomic model.

Vocabulary To Learn

  • Plum pudding model: Model of the atom showing that negative electrons are embedded in a ball of positive charge.
  • Rutherford's experiment: A stream of positive alpha particles fired through a thin piece of gold foil. This lead to an update of the atomic model, from the plum pudding model to nuclear model.
  • Nuclear model: Model of the atom with a small positive charge in the centre surrounded by a cloud of orbiting electrons. The atom is mostly empty space.

Common Mistakes To Avoid

  • Confusion between the models and the order in which they were conceived. Also, pupils often mix up which subatomic particles are present in each model.

3 Quick Questions (With Answers)

1. Explain the scientific idea in this lesson using two key points.

The atomic model has changed over time. Dalton, Thomson, Rutherford (Geiger and Marsden), Bohr and Chadwick have all suggested atomic models.

2. Define this scientific word and use it in context. 'Plum pudding model'

Model of the atom showing that negative electrons are embedded in a ball of positive charge. Include the word in a full scientific explanation, not as a single label.

3. Correct this common scientific misunderstanding.

Mistake: Confusion between the models and the order in which they were conceived. Also, pupils often mix up which subatomic particles are present in each model. Correction: Practise is required listing the key features of each model and the subatomic particles present. A timeline with the key features present helps pupils to understand the process of discovery and how long this can take.

More Lessons In This Unit

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