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What discovery led J.J. Thomson to decide that atoms were not indivisible, but are actually composed of smaller parts?

What discovery led J.J. Thomson to decide that atoms were not indivisible, but are actually composed of smaller parts?
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What discovery led J.J. Thomson to decide that atoms were not indivisible, but are actually composed of smaller parts?

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User Akhil Latta
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Answer:

Thomson used a beam of negatively charged particles.

Step-by-step explanation:

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User Tahlia
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Thomson used a beam of negatively charged particles. Using a beam of particles and detecting the scattering of the particles after they hit gold foil.
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User Daniel Wyatt
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