Question

what is the size of electrone

Answer 1

However jumping ahead to the information given in chapters on particle physics and nucleon structure it should be possible to estimate an electron's diameter based on a proton's. Without giving away the story in advance, based on this I estimate the radius of an electron to be approximately 10-16 metres.

Answer 2

Well, the classical radius of an electron (this is the 'electo-magnetic field' type of radius - nobody has actually measured the exact radius of an electron.) is about 2.82 x 10-15 m.