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The two fundamental particles inside the atom are-

Solution

✅ Correct Option: 4

The negatively charged electron, discovered by J. J. Thomson, and the positively charged proton, identified through Goldstein's canal ray experiments, are the two charged fundamental particles described in atomic structure. The neutron, found later by Chadwick, is electrically neutral. Option 1 is invalid since an atom is not a subatomic particle.

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