The mass of a ³He atom is 3.01602931 u. Thus Dm for the formation of one ³He nucleus is

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The mass defect (Δm) is calculated by subtracting the actual mass of the nucleus from the sum of the masses of its individual nucleons. For a helium-3 nucleus, which consists of 2 protons and 1 neutron, the mass defect is calculated as follows: Δm = (2 * mass of proton + 1 * mass of neutron) - mass of helium-3 nucleus. Using the standard atomic masses, Δm = (2 * 1.007276 u + 1 * 1.008665 u) - 3.01602931 u = -0.0082857 u.

The Mass of a 3He Atom Is 3

The Mass of a ³He Atom Is 3