Question

from his experiments, j. j. thomson concluded that cathode ray particles can move at very fast speeds. cathode ray particles can be moved by electric current. atoms contain small positively charged particles that are called protons. atoms contain small negatively charged particles that are called electrons.

Explanation:

J.J. Thomson's cathode - ray tube experiments led him to discover electrons. Cathode rays are composed of negatively - charged particles. Protons are positively charged and were discovered later (by Rutherford's team). The fact that cathode ray particles can be moved by an electric current is a property of charged particles, but the key conclusion was the discovery of electrons. The speed of cathode ray particles was not the main conclusion of his experiments.

Answer:

atoms contain small negatively charged particles that are called electrons.