Answer:
The correct option is b.
Explanation:
J.J. Thomson's cathode-ray experiment showed that atoms contain small negatively charged particles called electrons. J.J. Thomson's experiment showed how cathode rays were deflected away from negatively charged plates towards the positively charged plates (like charges repels but unlike charges attract). This model used by Thomson suggests that electrons (negatively charged) are in a cloud surrounding positively charged particles (protons).
