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Questions and Answers
What was Democritus's significant contribution to atomic theory?
What was Democritus's significant contribution to atomic theory?
What did J.J. Thomson's cathode ray experiment lead to the discovery of?
What did J.J. Thomson's cathode ray experiment lead to the discovery of?
What major change did Rutherford's gold foil experiment bring to the atomic model?
What major change did Rutherford's gold foil experiment bring to the atomic model?
How does the Bohr Model of the atom differ from earlier models?
How does the Bohr Model of the atom differ from earlier models?
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What is the primary feature of the nuclear model of the atom proposed by Rutherford?
What is the primary feature of the nuclear model of the atom proposed by Rutherford?
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Which of the following subatomic particles did James Chadwick discover?
Which of the following subatomic particles did James Chadwick discover?
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What aspect of the modern quantum mechanical model of the atom was developed by Schrödinger?
What aspect of the modern quantum mechanical model of the atom was developed by Schrödinger?
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Which statement is true about the size of the atomic nucleus compared to the atom as a whole?
Which statement is true about the size of the atomic nucleus compared to the atom as a whole?
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Study Notes
Early Atomic Models
- Democritus proposed the "atomos" – indivisible particles, an early atomic concept.
- J.J. Thomson's plum pudding model depicted the atom as a sphere of positive charge with negative electrons embedded.
Discovery of the Electron
- J.J. Thomson's cathode ray experiment discovered the electron, revealing their negative charge through deflection.
Rutherford's Nuclear Model
- Rutherford's gold foil experiment revealed the atom's nuclear structure: a dense, positively charged nucleus surrounded by orbiting electrons.
- The Nuclear Model highlights the atom's central nucleus, containing most of its mass, surrounded by a vast majority of empty space and electrons.
Bohr Model
- Niels Bohr's model proposed electrons orbiting in specific energy levels, without continuous energy emission.
Discovery of the Neutron
- James Chadwick discovered the neutron, a neutral subatomic particle roughly equal in mass to a proton.
Modern Quantum Mechanical Model
- Erwin Schrödinger's wave equation describes electrons as wave-like particles within a probabilistic region around the nucleus instead of fixed orbits.
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Description
Explore the journey of atomic models from early concepts by Democritus to Rutherford's nuclear model and Bohr's energy levels. This quiz covers important discoveries including the electron and neutron, highlighting key experiments in atomic theory.
