Why are all electrons the same and how do we know?

Question

I read on an article that electrons are “all the same.” Why is that and what does that mean? How can electrons be identical? Does that apply to other elementary particles?

In: 9

Answer 1

All electrons have the exact same mass and charge. We know because we have measured, used, interacted with and experimented on them for a long time and havn’t found one that is different.