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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?
- Marie Curie
- Ernest Rutherford
- J.J. Thomson (correct)
- Niels Bohr
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?
- The mass is distributed only around the nucleus
- The mass is concentrated at the center of the atom
- The mass is negligible compared to the charges
- The mass is uniformly distributed over the atom (correct)
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?
- Because the model was inspired by a pudding recipe
- Due to the presence of positively charged raisins in the atom
- Due to the spherical shape of the atom resembling a pudding
- Because electrons are embedded in a sphere of positive charge like raisins in a pudding (correct)
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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