Final answer:
A neutron and proton are about the same mass (1.67 × 10^-24 grams) and both are nucleons, but protons have a positive electric charge while neutrons are electrically neutral.
Step-by-step explanation:
The similarity that a neutron and proton share is that they both have approximately the same mass, which is about 1.67 × 10-24 grams. In the context of atomic mass units (amu) or Daltons, this mass is considered equivalent to one atomic mass unit.
Protons and neutrons are collectively referred to as nucleons, indicating that they are the constituents of atomic nuclei. While a proton carries a positive electric charge, a neutron is electrically neutral, having no electric charge. Additionally, both nucleons have an intrinsic spin and are much more massive than electrons, approximately 1836-1839 times greater in mass.