Atomic Models Worksheet
Explore the historical development and key features of atomic models, from Dalton to the Quantum Mechanical Model, through various question types.
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Atomic Models Worksheet
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 atomic model proposed that electrons orbit the nucleus in fixed energy levels?
Dalton's Atomic Model
Thomson's Plum Pudding Model
Bohr's Atomic Model
Rutherford's Nuclear Model
2. The discovery of the electron is credited to which scientist?
John Dalton
Ernest Rutherford
Niels Bohr
J.J. Thomson
3. In Rutherford's gold foil experiment, most alpha particles passed straight through, indicating that atoms are mostly .
4. The Quantum Mechanical Model describes electrons in terms of of finding them in a certain region around the nucleus.
5. Dalton's atomic theory stated that atoms of the same element are identical in mass and properties.
True
False
6. The Plum Pudding Model suggested that the atom is a dense, positively charged sphere with electrons embedded within it.
True
False
7. Briefly explain the main difference between Rutherford's Nuclear Model and Bohr's Atomic Model.
Match each scientist with their significant contribution to atomic theory.
8. John Dalton
a. Discovered the electron
9. J.J. Thomson
b. Proposed the planetary model of the atom
10. Ernest Rutherford
c. Developed the first comprehensive atomic theory
11. Niels Bohr
d. Proposed electrons orbit in fixed energy levels
12. Describe the evolution of atomic models from Dalton's theory to the Quantum Mechanical Model, highlighting the key experiments and discoveries that led to each new model. Include a discussion of the limitations of each model that led to its refinement.
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