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The billiard ball model was the working model of the atom until thomson discovered the

a. nucleus.
b. proton.
c. neutron.
d. electron.

User Xiaoyu Lu
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2 Answers

4 votes
The right answer is D, electron.

User Arland
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d. electron

J J Thomson discovered the electron, and it was put in his model of the atom.
User Pierre C
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