Chemistry Year 11 - Module 1 - Lesson 13
Atomic Structure and Models of the Atom
1. Key Ideas
In 1897, J.J. Thomson discovered the electron and shattered the 2,400-year-old idea of an indivisible atom. By 1911, Rutherford's gold foil experiment revealed a tiny, dense, positive nucleus surrounded mostly by empty space. By 1913, Bohr had quantised electron energies into fixed orbits. Each model was revolutionary — and each was later proved incomplete. Science advances not by being right, but by making better models as new evidence arrives. This is IQ3: how do scientists develop understanding of atomic structure from experimental evidence?
- The key features of Thomson, Rutherford, and Bohr models
- Why each model was an improvement on the previous one
2. Success Criteria
By the end, you should be able to:
- The key features of Thomson, Rutherford, and Bohr models
- The experimental evidence that led to each model
- Subatomic particles: proton, neutron, electron (mass, charge, location)
3. Key Terms
4. Activity: Build the Lesson Map
Use the lesson to complete the table. Keep answers brief but specific.
| Prompt | Your answer |
|---|---|
| Main concept | |
| Important example | |
| Common mistake to avoid | |
| How this links to the next lesson |
5. Short Answer Questions
1. 6. Describe Rutherford's gold foil experiment, including the experimental design, observations, and the conclusions drawn about atomic structure.
2. 7. Explain how the development of atomic models illustrates the nature of science — specifically the idea that models are revised when new evidence emerges. Use at least two specific historical examples.
6. Extend: Apply the Idea
A student gives a memorised answer about Atomic Structure and Models of the Atom but does not use evidence or reasoning.
Improve the answer by writing a stronger response that uses accurate terminology, a relevant example and a clear explanation.
7. Multiple Choice
1. What is the best first step when answering a question about Atomic Structure and Models of the Atom?
A. Identify the key concept being tested
B. Write every fact from memory
C. Ignore the command word
D. Skip examples and evidence
2. Which answer would show stronger understanding of Atomic Structure and Models of the Atom?
A. An answer with accurate terms and reasoning
B. A copied definition only
C. A single-word response
D. An answer with no example
3. What should you do if a question asks you to explain?
A. Link the idea to a reason or cause
B. List unrelated facts
C. Only draw a diagram
D. Write the shortest possible answer
8. Success Criteria Proof
Finish with evidence that you can do each success criterion.