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Atomic mass is so small you can't actually measure it. So, just like carbon dating, you have to use a relative mass.
The relative atomic mass is 83.798. So where did you get that it is not determined.
Magnets can be made from many different metals so there is no specific atomic mass.
The atomic mass is the mass of a molecule, atomic particle or sub-atomic particle.
The average atomic mass is the ratio of the average mass of one atom of an element to one twelfth of the mass of an atom of carbon-12. It is, the mass of an atom of the substance, rescaled so that carbon-12 would have a mass of 12.