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Perhaps it did not occur to you but unobtanium is an element which cannot be obtained!

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Q: What is the average atomic mass of unobtanium-221?
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What is the average atomic mass compared to atomic mass?

Atomic mass is the number of protons and neutrons in an atom.


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No, the atomic mass is the average mass of the atom and the atomic diameter is the average diameter of the atom


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The average atomic mass of an element is the average of the atomic masses of its isotopes (that is a weighted average). You have to take into account the abundance of each isotope when they do your averaging.