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The proton is about 1.6–1.7 fm in diameter.

Quoted from Wikipedia.

That is,The proton just occupies a definite volume or a definite space. But I can't find the radius of an electron in Wikipedia. Can I infer from this that Electron does not have a definite volume.

Electron is round

If Electron and the rest of sub-atomic particles don't have a definite volume, Then why their composition does so?

Do the uncertainty in position of a particle restricts to decide the volume of the particle too?

I just found a website which says that the electron is spherical!

A 10-year study has revealed that the electron is very spherical indeed. To be precise, the electron differs from being perfectly round by less than 0.000000000000000000000000001 cm. To put that in context; if an electron was the size of the solar system, it would be out from being perfectly round by less than the width of a human hair.

Source : wired.co.uk

Is Volume in the quantum scale definable?

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  • $\begingroup$ The electron will occupy whatever volume is available to it. The less space it gets, the more energy it takes to contain it. This remains true for extremely small volumes in high energy physics experiments, which is why we usually assume that the electron itself can be described as a point particle up to the level of the highest energies we can create, so far. $\endgroup$ – CuriousOne Oct 4 '14 at 13:35
  • $\begingroup$ Then, the electron occupies the entire universe having zero energy because of Infinite space available to it. Can you please elaborate the volume available to it? $\endgroup$ – ryanafrish7 Oct 4 '14 at 13:41
  • $\begingroup$ Let electron does not occupy any volume, and it is considered to be a point-like particle. I just found that proton only have a charge radius and not a definite one. $\endgroup$ – ryanafrish7 Oct 4 '14 at 15:27
  • $\begingroup$ The discussions in the Do electrons have shape? seems to talk about the shape of higher probability positions of the electrons and not the actual shape of electrons $\endgroup$ – ryanafrish7 Oct 4 '14 at 15:32
  • $\begingroup$ "I just found a website which says that the electron is spherical!" The electron has neither a known size nor any known shape. For that matter while it is true that the proton occupies volume it is a little strong to say it occupies a "definite" volume: there are several reasonable way to measure it's diameter and they give answers varying by tens of percent. $\endgroup$ – dmckee --- ex-moderator kitten Oct 4 '14 at 16:53