The first scientist to show that atoms emit any negative particles was

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J.J. Thomson was the first scientist to show that atoms emit negative particles, which he identified as electrons. He discovered this through his experiments with cathode ray tubes in the late 19th century. Lord Kelvin, Ernest Rutherford, William Thomson, and John Dalton made significant contributions to the field of atomic theory, but they did not specifically discover the emission of negative particles by atoms.

The First Scientist to Show That Atoms Emit Any Negative