What type of particles did J.J. Thomson study to find the first evidence for isotopes?
Alpha particles
Beta particles
Gamma particles
Canal rays
Answer
J.J. Thomson studied canal rays, or positive ions, to find the first evidence for isotopes of stable elements. Canal rays are beams of positive ions that are produced in a gas discharge and can be separated by their mass-to-charge ratio using a magnetic field.
Unlocking the Secrets of the Atom: The J.J. Thomson Chronicles!