Answer
The element is vanadium V with the atomic mass 50.9415 amu.
Work Step by Step
The atomic mass of the element is found by multiplying each isotopic mass by its fraction, and then add all of them.
49.9472 amu x 2.500 * $10^{-3}$ = 0.1249 amu
50.9440 amu x 0.9975 = 50.8166 amu
____________________________
Sum: 50.9415 amu
We see in the periodic table of elements that vanadium V, has the atomic mass 50.9415 amu, that is the number we found .
Therefore the element is vanadium V with the atomic mass 50.9415 amu.
