Relative Comparison of Sizes:
- For all intents & purposes, an electron is treated as a point particle {a wave that lacks any physical dimension} & considered to have a radius of zero (effectively < 10-18 m = 0.001 fm).
- By contrast, the radius of a neutron is approximately 0.8 fm (femtometer) = 0.8x10-15 m so its volume is at least one billion times larger than that of an electron.
- Whereas the volume ratio of a proton:neutron ~ 1:1 because their radii are almost identical.
