Question

question 5 of 10
what did thomson discover?
a. the neutron
b. the electron
c. the nucleus
d. the proton

Explanation:

In 1897, J.J. Thomson conducted experiments with cathode - ray tubes. He showed that cathode rays were composed of negatively charged particles. These particles were later named electrons. The neutron was discovered by James Chadwick. The nucleus was discovered by Ernest Rutherford through the gold - foil experiment. The proton was also discovered by Ernest Rutherford (in a different set of experiments related to the nucleus).

Answer:

B. The electron