From the following list of observations, choose the one that most clearly supports the conclusion that atoms contain electrons.
A) the emission spectrum of hydrogen
B) cathode "rays"
C) diffraction
D) the photoelectric effect
E) the scattering of alpha particles by metal foil

Question

Quizplus · Accepted Answer

Cathode "rays" were discovered to be negatively charged particles, which were later identified as electrons.

From the Following List of Observations, Choose the One That