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The neutron has about the same mass as the proton, each has a mass a tiny amount greater than 1 AMU (Atomic Mass unit). The neutron is the smallest bit more massive.

The electron has a mass of just a bit over 5/10,000ths of an AMU. Extremely less massive in comparison, isn't it!

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6y ago
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13y ago

The mass of a proton is equal to a neutron.

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14y ago

Neutrons are very close to the proton, but not exactly the same mass

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11y ago

mass of protons and neutrons are similar (~ 1 amu)

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Q: What is equal to the mass of a proton?
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