Question

which part of john daltons theory was disproved by j.j. thomsons cathode - ray tube experiments? (1 point)
atoms can join together
atoms are indivisible.
atoms can form new substances.
atoms are small

Explanation:

J.J. Thomson's cathode - ray tube experiments led to the discovery of electrons. This showed that atoms are not indivisible as Dalton's theory proposed. Dalton thought atoms were the smallest, indivisible particles of matter.

Answer:

Atoms are indivisible.