What is the relationship between the atomic mass of an isotope and the Average Atomic Mass found on the Periodic Table? A.): The Average Atomic Mass of an element on the periodic table is always the same as the atomic mass of the most abundant isotope.
B.): The Average Atomic Mass of an element on the periodic table is the sum of the masses of all stable isotopes.
C.): The Average Atomic Mass of an element on the periodic table will be closest to the atomic mass of the most abundant isotope.