The main difference between protons and neutrons is that protons have an electrical charge, while neutrons have no charge. Protons are positively charged, whereas neutrons are neutral. The other options you've mentioned are not accurate: protons and neutrons have very similar masses, both are located in the nucleus of the atom, and their volumes are essentially indistinguishable in the context of atomic structure.
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.
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