What is the standard unit used to express the mass of protons and neutrons?

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Multiple Choice

What is the standard unit used to express the mass of protons and neutrons?

Explanation:
Masses of protons and neutrons are extremely small, so a specialized unit is used to keep the numbers convenient. The atomic mass unit is defined as 1/12 the mass of a carbon-12 atom, which makes the mass of a proton about 1.007 amu and a neutron about 1.009 amu. This scale keeps nucleon masses near unity, rather than dealing with numbers like 10^-27 kilograms. It also ties directly to how we relate atomic masses to molar masses, since 1 amu is roughly 1.66×10^-27 kg. The term Dalton is essentially the same unit, but the standard expression for these particles is the atomic mass unit.

Masses of protons and neutrons are extremely small, so a specialized unit is used to keep the numbers convenient. The atomic mass unit is defined as 1/12 the mass of a carbon-12 atom, which makes the mass of a proton about 1.007 amu and a neutron about 1.009 amu. This scale keeps nucleon masses near unity, rather than dealing with numbers like 10^-27 kilograms. It also ties directly to how we relate atomic masses to molar masses, since 1 amu is roughly 1.66×10^-27 kg. The term Dalton is essentially the same unit, but the standard expression for these particles is the atomic mass unit.

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