Are protons and neutrons considered point particles?

[magdi_gamal]

I find it confusing, I tried to google the topic but I still don't get it. What is the size and shape of subatomic particles? do they have a size or shape at all? and does the fact that protons and neutrons have larger mass than electrons mean they're bigger in size?

 

[mfb]

Protons and neutrons are made out of quarks and gluons, see Wikipedia:proton for a more detailed description. Shape and size are a bit problematic to define in quantum mechanics, but independent of the chosen definition, they have a non-zero size, and the shape is spherical within the measurement uncertainties.

This has nothing to do with their mass. There are elementary particles* that have ~100 times the mass of proton and neutron.

*or at least particles where no substructure is known, and with very good arguments for them to be really elementary

 

[Meir Achuz]

The proton and neutron each have a radius of a little over 0.8 fm.