Hi,
What we know about the size of electrons is that it does not have a structure, even if you test it with a scope that has resolution of 10-18m. This means that the electron’s size needs to be less than the number. The name of this area refers to the Large Hadron Collider which is the highest energy collider located in CERN, Geneva. We are a particle physicist on one of the experiments of this collider. We attempt to discover the electron’s structure using our research, however we came to the conclusion the electron to be a fundamental particle having no dimensions or, you could say that it is a size of 10-18m.