Atomic Models Worksheet
A Grade 12 Chemistry worksheet covering the historical development and key concepts of atomic models, from Thomson to Quantum Mechanical.
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Standards
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Atomic Models: A Journey Through Time
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Read each question carefully and provide your best answer. This worksheet assesses your understanding of the historical development and key characteristics of atomic models.
1. Which atomic model proposed that electrons orbit the nucleus in specific energy levels or shells?
Thomson's Plum Pudding Model
Rutherford's Nuclear Model
Bohr's Model
Dalton's Atomic Theory
2. The discovery of the electron led to the proposal of which atomic model?
Rutherford's Model
Bohr's Model
Thomson's Model
Quantum Mechanical Model
1. In the Rutherford gold foil experiment, most alpha particles passed straight through, indicating that the atom is mostly space.
2. The Mechanical Model describes electrons in terms of probabilities, occupying regions called orbitals.
3. Bohr's model introduced the concept of quantized levels for electrons.
1. Dalton's atomic theory stated that atoms of the same element are identical in mass and properties.
True
False
2. The Quantum Mechanical Model definitively describes the exact path an electron takes around the nucleus.
True
False
Match each scientist with their key contribution to atomic theory.
1. J.J. Thomson
a. Discovered the nucleus through the gold foil experiment
2. Ernest Rutherford
b. Proposed the Plum Pudding model after discovering electrons
3. Niels Bohr
c. Introduced quantized energy levels for electrons
1. Briefly explain the main difference between Bohr's atomic model and the Quantum Mechanical Model.
2. Describe one limitation of Rutherford's atomic model.
Refer to the image below of Thomson's atomic model:
Based on this model, what is the atom primarily composed of, and how are the electrons distributed within it?
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