What did j. j. thomson's cathode-ray tube experiment show? a. atoms are small individual spheres. b. electrons are in a cloud surrounding positively charged particles. c. matter can be neither created nor destroyed. d. atoms consist of at least some negatively charged particles.

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).

the answer for sodium is 0.186

the answer for rubidium is 0.251

i believe the answer is true.