Name: ______________________
1. Complete the table below.
Sub-Atomic Particle
Who discovered it?
When was it
discovered?
2. What did Democritus propose?
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3. What was the “plum pudding model”? Draw a diagram to show it.
4. What is the “Bohr” model of the atom? Draw a diagram to show it.
Name: ______________________
5. Who suggested the “quantum model” of the atom?
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6. Describe how the quantum model is different to the Bohr model.
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7. What is the “standard model of matter”?
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8. Is it accurate to say that protons, neutrons and electrons are the
smallest types of particles?
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