What evidence is there that electrons are negatively charged particles?

Answer 1

You should understand that it is an arbitrary choice, to call the charge on an electron negative rather than positive. Everything that we know about electromagnetism and sub-atomic particles would work just as well if we had decided to call the charge on the electron plus one, and the charge on the proton minus one. What matters is that protons and electrons have opposite charges (and of course, the various other charged particles have their various charges which relate to the charges of protons and electrons). That is all that we are trying to convey by the use of the term negative. It is opposite to the proton.

The existence of these charges is abundantly, even super-abundantly verified by countless millions of experiments, observations, electrical devices, etc.

Answer 2

The deflection of the particles toward positively charged plates demonstrated the negatively

charged nature of the electrons; the fact that changing the type of electrode or the type of gas

used in the cathode ray tube did not affect the ray produced led to the conclusion that electrons

are present in all matter

Answer 3

Electrons carry charge. The fact that it has been decided to call the charge 'negative' has historical and experimental roots. There is nothing "bad" about negative charge.

Answer 4

Electrons are negatively charged and atoms must contain some positive charges to balance since atoms have no charge.. Read your freaking chemistry book!