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

We don’t know that they are the same. But we haven’t found any that are different. And all measures of the size of the electron show that it is smaller than the minimum size that we can measure. So the model of all electrons being the same and being a point with no size and no substructure fits all the data we have.