Question

who is credited with the discovery of the electron?
j.j. thomson
niels bohr
ernest rutherford
john dalton

Explanation:

J.J. Thomson discovered the electron through his cathode ray tube experiments. Niels Bohr worked on atomic structure models, Ernest Rutherford on the nuclear model of the atom, and John Dalton on atomic theory related to elements and compounds. So the correct option is the one with J.J. Thomson.

Answer:

A. J.J. Thomson