🔬 Part 1: Historical Atomic Models

1. Which scientist proposed the first atomic theory in 1803?

John Dalton

J.J. Thomson

Ernest Rutherford

Niels Bohr

2. Thomson's "plum pudding" model (1897) suggested that:

Atoms were solid spheres

Electrons were embedded in a positive sphere

Atoms had a dense nucleus

Electrons orbited in fixed paths

3. Rutherford's gold foil experiment (1911) led to the discovery of:

Electrons

Protons

The atomic nucleus

Neutrons

4. Which atomic model features electrons in specific energy levels or shells?

Dalton's model

Thomson's model

Rutherford's model

Bohr's model

⚛️ Part 2: Atomic Structure Components

5. Fill in the blanks about atomic particles:

The three main particles in an atom are __________, __________, and __________.

__________ and __________ are found in the nucleus, while __________ orbit around it.

6. Explain how scientific evidence led to changes in atomic theory. Use at least two historical examples:

7. Why was Rutherford's nuclear model an improvement over Thomson's "plum pudding" model?

🧪 Part 3: Timeline and Reflection

8. Arrange these atomic models in chronological order (1-4):

_____ Bohr's planetary model

_____ Dalton's solid sphere model

_____ Rutherford's nuclear model

_____ Thomson's plum pudding model

9. How did collaboration and peer discussion help you understand atomic structure better during today's lesson?

10. What is one new thing you learned about atomic structure today?

Atomic Structure History

Atomic Structure History

🔬 Part 1: Historical Atomic Models

⚛️ Part 2: Atomic Structure Components

🧪 Part 3: Timeline and Reflection

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