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

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

2 Answers

4 votes
The right answer is D, electron.

answered
User Arland
by
8.3k points
1 vote
d. electron

J J Thomson discovered the electron, and it was put in his model of the atom.
answered
User Pierre C
by
7.7k points

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