Radius of atom parts

[ComputerPsi]

Do anybody know the radius of an electron, proton, or neutron? I understand there are smaller things like quarks, and everything, but as a general size, does anybody know the radius of these parts of an atom?

[humanino]

Electron and quarks are so far pointlike particles. The radius of the proton and/or the neutron depends on how you actually define such a thing. Typical values for the radius of nucleon are of the order 1 fm, which is 10^{-15} m.

[humanino]

Play at hyperphysics (http://hyperphysics.phy-astr.gsu.edu/hbase/nuclear/nucuni.html)