I think I discovered element 120, which would be the last element in the 2A column. It consists of two isotopes. The abundance of the first isotope is 68.00% and its atomic mass is 294.6 u. The abundance of the second isotope is _________ (you can figure this out since there are only two isotopes) and its atomic mass is 297.8 u. What is the average atomic mass of the element?
a. 296.2 u
b. 295.0 u
c. 296.8 u
d. 295.6 u
e. 297.4 u
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