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A proton is a positively charged particle in the center of an atom.

A neutron is another particle in the center of an atom that has no charge, but still has mass.

Each particle, sometimes called a subatomic particle, has a mass of one AMU. The sum of these is the mass of one atom of an element.

Electrons, the particles orbiting the nucleus, where protons and neutrons reside, are not taken into account in massing because they are so small.

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