Average atomic mass of X is 126.8 and the element is Iodine.
What is average atomic mass?
The average atomic mass of an element is the total of its isotope masses, each multiplied by its natural abundance.
Now, average atomic mass can be calculated by using the following formula,
[tex]Average\; atomic\; mass\\=\;(126.9045\;.\frac{80.45}{100} )\;+\;(126.0015\;.\frac{17.23}{100} )\;+\;(128.2230\;.\frac{2.32}{100} )\\=\;(126.9045\;.\;0.8045)\;+\;(126.0015\;.\;0.1732)\;+\;(128.2230\;.\;0.0232)\;\\=\;102.09467025\;+\;21.71005845\;+\;2.9747736\\=\;126.7795023\\=\;126.8[/tex]
Average atomic mass of X is 126.8.
Using the periodic table, the element can be identified by comparing their atomic mass.
Hence, the element is Iodine (I).
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