Question

Which is larger the diameter of a nucleus or the diameter of a protron?

Answer 1

Diameter of neutron is greater. Protons are generally much smaller.

Answer 2

Inside a nucleus are neutrons and protons, which occupy a space about 100,000 times smaller than the whole atom. In the pond example, a proton would measure about 1/50th inch (0.5 millimeters) in diameter—about the size of a pinpoint.

So the answer would be the diamter of a nucleus.