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How did j.j thomson's discovery affect the model of the atom?

Ait proposed that atoms are mostly composed of empty space
Bit proposed that electrons orbit the nucleus like the planets in the solar system.
Cit proposed the idea that electrons were mobile in the atom.
Dit proposed that the positive charge was concentrated in the nucleus.

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J.J Thompson, by carrying out a series of experiments with a cathode ray, realized that electric charge is composed of many smaller particles; particles that are also smaller than atoms. The experiment showed that these particles are mobile; therefore, he proposed the idea that electrons are mobile in the atom. The answer is C

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