Grade 11 Atomic Models Worksheet
Explore the evolution of atomic models from Dalton to quantum mechanics with this comprehensive Grade 11 science worksheet.
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Grade 11 Atomic Models Worksheet
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Read each question carefully and answer to the best of your knowledge. Show all your work for calculations.
1. Which atomic model proposed that electrons orbit the nucleus in specific energy levels or shells?
Dalton's Atomic Model
Thomson's Plum Pudding Model
Bohr's Model
Rutherford's Nuclear Model
2. The discovery of the electron led to the proposal of which atomic model?
Dalton's Model
Thomson's Model
Rutherford's Model
Bohr's Model
1. In Rutherford's gold foil experiment, most alpha particles passed straight through, indicating that the atom is mostly .
2. The Heisenberg Uncertainty Principle states that it is impossible to precisely know both the and of an electron at the same time.
3. The quantum mechanical model describes the probability of finding an electron in a certain region of space called an .
1. Dalton's atomic theory proposed that atoms of the same element are identical in mass and properties.
True
False
2. The Bohr model successfully explained the spectra of multi-electron atoms.
True
False
1. Briefly describe the main contribution of J.J. Thomson to the development of atomic models.
2. Explain why the Rutherford model was considered an improvement over the Thomson model, but also had limitations.
Match each scientist with their primary contribution to atomic theory.
1. John Dalton
a. Discovered the electron
2. J.J. Thomson
b. Proposed the planetary model of the atom
3. Ernest Rutherford
c. Developed the first atomic theory based on experimental evidence
4. Niels Bohr
d. Proposed electrons exist in quantized energy levels
The quantum mechanical model of the atom describes the wave-like properties of electrons and their probable locations. Unlike the Bohr model, it does not define a precise orbit for electrons.
Consider a hydrogen atom. Sketch a representation of the 1s and 2p orbitals, showing the general shape and relative size of each.
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