What are densities values for subatomic particles
If you mean the standard mass-per-volume density, then there really aren't any. Density is pretty much only used when dealing with a collection of many particles.
If you wanted to come up with a number for protons and neutrons, try googling "radius of proton" and then divide the mass by the volume of a sphere of that radius. Buy I don't know why that would be a useful thing to do.
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