Perhaps it did not occur to you but unobtanium is an element which cannot be obtained!
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To find the average Atomic Mass of unobtanium-221, you would need to know the isotopic abundances of each isotope of unobtanium in nature. Then, you would calculate the weighted average of the isotopic masses based on their abundances. Without this specific information, the average atomic mass of unobtanium-221 cannot be determined.
The average atomic mass is a weighted average of the masses of all isotopes of an element, taking into account their abundance. The atomic mass listed on the periodic table is the weighted average of all naturally occurring isotopes of the element. So, they are essentially the same thing, with the average atomic mass being a more specific term.
Average atomic mass is the weighted average mass of all the isotopes of an element, taking into account their natural abundances. Atomic mass refers to the mass of a single atom of a specific isotope of an element.
Atomic mass refers to the mass of an individual atom of a specific element, while average atomic mass is the weighted average of the masses of all the isotopes of an element, taking into account their relative abundance in nature. Average atomic mass is usually listed on the periodic table, while atomic mass is specific to a single isotope.
Carbon has an average atomic mass of about 12.
The Atomic Mass of krypton is 83.80(1) if you round 84