Which part of John Dalton's theory was disproved by J.J. Thomson's cathode-ray tube experiments?

Question

A. Atoms are indivisible
B. Atoms can join together
C. Atoms are small
D. Atoms can form new substances

Answer 1

The part of John Dalton's theory that was disproved by J.J. Thomson's cathode-ray tube experiments is:

A. Atoms are indivisible.

Thomson's experiments showed that atoms could be divided into smaller particles, specifically electrons, which indicated that atoms were not indivisible as Dalton had proposed.