Answer
The mass of the element is roughly 140.116amu. By looking at our periodic table the element is Cerium.
Work Step by Step
To find the element that these four isotopes belong to, we must find the mean mass by multiplying all four masses by their abundances in a percentage decimal (i.e. 88% would be 0.88).
Mean mass= ((135.90714)(0.0019)+(137.90599)(0.0025)+(139.90543)(0.8843)+(141.90924)(0.1113))= 140.116amu
