What is the significance of eugen goldstein’s experiment as it applies to the atomic model plss asapp

Millikan's experiment showed that they exist as whole-number multiples of a single basic unit. Atoms have no overall electrical charge, meaning that each and every atom contains an exactly equal number of positively and negatively charged particles. A hydrogen atom is the simplest kind of atom with only one electron

He discovered several important properties of cathode rays, which contributed to their later identification as the first subatomic particle, the electron. ... Because these latter rays passed through the holes, or channels, in the cathode, Goldstein called them Kanalstrahlen, or canal rays.

1.solid

2.carbon dioxide

3.helium