Question

question 28 of 28 j.j. thomson discovered the electron by noticing that a. a beam of particles could be influenced by an electric or magnetic force. b. molecules with the same atoms exhibited the same chemical properties. c. some particles in a beam were deflected when passed through a sheet of gold foil. d. chemical compounds contained various combinations of at least two atoms.

Explanation:

J.J. Thomson discovered the electron through cathode ray tube experiments, where he observed that the cathode ray (a beam of particles) was deflected by electric and magnetic fields, indicating the particles were charged.

Answer:

A. a beam of particles could be influenced by an electric or magnetic force.