The average mass of a boron atom is 10.81.Assuming you were able to isolate only one boron atom,the chance that you would randomly get one with a mass of 10.81 is

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The average atomic mass of boron (10.81) is a weighted average of the masses of its isotopes, not the mass of any individual atom. Individual boron atoms can only have the mass of one of its isotopes, not an average, so the chance of getting an atom with exactly 10.81 u is 0%.

The Average Mass of a Boron Atom Is 10