Respuesta :
Answer: The correct answer is cathode rays are made up of negatively charged particles and atoms contain negatively charged particles.
Explanation: J.J.Thomson lead an experiment known as cathode ray experiment. In his experiment he proved that rays produced by the cathode are actually the stream of negatively charged particles which are known as electrons.
He then discovered that atoms contain negatively charged particles known as electrons.
Hence, the correct answer is cathode rays are made up of negatively charged particles and atoms contain negatively charged particles.