What is the main difference between protons and neutrons?

Protons have a much smaller mass than neutrons.
Protons have a much larger volume than neutrons.
Protons have an electrical charge, but neutrons have no charge.
Protons make up the nucleus, but neutrons orbit around the nucleus

Protons have a positive electrical charge, while neutrons have no electrical charge. This is the main difference between the two particles. Additionally, protons make up the nucleus of an atom along with neutrons, while neutrons do not orbit around the nucleus.