History of Atomic Models
Explore the evolution of atomic theory from ancient philosophy to modern quantum mechanics with this Grade 9 science worksheet.
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History of Atomic Models
Name:
Date:
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Read each question carefully and answer to the best of your ability. Show all your work where applicable.
1. Which ancient Greek philosopher first proposed the idea of 'atomos', indivisible particles?
Aristotle
Plato
Democritus
Socrates
2. John Dalton's atomic theory proposed that all atoms of a given element are in mass and properties.
3. J.J. Thomson's model of the atom is often referred to as the model.
4. Describe the key difference between Rutherford's model of the atom and Thomson's model.
5. Niels Bohr proposed that electrons orbit the nucleus in specific energy levels or shells.
True
False
Match each scientist with their atomic model contribution.
6. Dalton
a. Plum Pudding Model
7. Thomson
b. Planetary Model
8. Rutherford
c. Solid Sphere Model
9. Bohr
d. Electron Shells
10. Observe the image below. Which atomic model does it represent and what are its main features?
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