Question

question 11 (1 point) which observation led j.j. thompson to conclude that negative particles existed within the atom? deflection of alpha particles atomic absorption spectra atomic emission spectra the deflection of cathode rays by an electric field absorption of beta particles

Explanation:

J.J. Thompson observed the deflection of cathode - rays by an electric field. This led him to conclude the existence of negatively - charged particles (electrons). Cathode rays are streams of electrons.

Answer:

the deflection of cathode rays by an electric field