How do we find the number of neutrons in a nuclide, given #Z#, and the isotopic mass?
The number of neutrons equals the
To a first approximation, the mass of the nuclide is the number of massive nuclear particles, i.e. the
By way of example, the most abundant element in the universe is hydrogen,
Most higher elements contain a number of isotopes, and their reported atomic mass is the weighted average of the individual isotopes.