Final answer:
Protons and neutrons have a mass of about 1.67 x 10-24 grams, while electrons have a much smaller mass. Neutrons and protons are approximately the same size and mass because they both are close to 1 atomic mass unit (amu).
Explanation:
Protons and neutrons have a mass of about 1.67 x 10-24 grams, which is considered one atomic mass unit (amu). In comparison, the mass of an electron is much smaller, about 1/1840 of the mass of a proton or neutron. Therefore, neutrons are about the same size and mass as a proton because they both have a mass close to 1 amu.
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