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Questions and Answers
Who proposed the plum-pudding model of an atom?
Who proposed the plum-pudding model of an atom?
What did J.J. Thomson assume about the mass distribution in the atom?
What did J.J. Thomson assume about the mass distribution in the atom?
Why is the plum-pudding model also known as the raisin pudding model?
Why is the plum-pudding model also known as the raisin pudding model?
What did the plum-pudding model fail to explain?
What did the plum-pudding model fail to explain?
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What did J.J. Thomson conclude about the total positive and negative charges in an atom?
What did J.J. Thomson conclude about the total positive and negative charges in an atom?
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Study Notes
Atomic Structure
- J.J. Thomson proposed the plum-pudding model of an atom, where an atom is composed of a sphere of positive matter with negative electrons embedded within.
Mass Distribution
- J.J. Thomson assumed that the mass of an atom was evenly distributed throughout the sphere of positive matter.
Plum-Pudding Model
- The plum-pudding model is also known as the raisin pudding model due to the resemblance of the negatively charged electrons (raisins) embedded in the positively charged sphere (pudding).
Limitations
- The plum-pudding model failed to explain the results of the gold foil experiment and the existence of small, dense nuclei at the center of atoms.
Charge Balance
- J.J. Thomson concluded that the total positive charge in an atom is equal to the total negative charge, resulting in a neutral atom.
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Description
Test your knowledge of J.J. Thomson's model of an atom with this quiz. Explore the concept of the atom as a uniform sphere of positive charge with embedded electrons, and the distribution of mass and charges within the atom.
