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What did the plum pudding model, proposed by J. J. Thomson, picture the atom as?
AA positive sphere with electrons scattered inside
BA dense nucleus orbited by distant electrons
CA cloud of probability with no fixed structure
DA ring of neutrons surrounding a proton core
Answer & Solution
Correct answer: A. A positive sphere with electrons scattered inside
1. The plum pudding model was the accepted picture of the atom before Rutherford's experiment.
2. It suggested the atom was a spherical ball of positive charge with electrons scattered evenly through it.
3. A dense nucleus orbited by distant electrons describes the later planetary model, not the plum pudding model.
4. A probability cloud and a ring of neutrons are not part of this early model at all.
5. So a positive sphere with scattered electrons is correct.
_Source: OpenStax Physics (CC BY 4.0), Ch 22 "The Atom", section 22.1 The Structure of the Atom_
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