Weight of the protons and neutron in the nucleus. Electrons weigh so little, it wouldn't affect the outcome unless rounding to about 36 digits.
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The international (SI) unit of mass is the kilogram.
The standard unit to measure mass is kilograms.
The same unit as you use to measure any mass. The SI unit for mass is the kilogram.
Some mass is "lost" during nuclear fusion and E = mc2 gives the amount of energy that this "lost" mass will be equal to.
Usually to measure mass, one uses grams or kilograms.