With mass 203.973 amu an element consists of 1.40% of an isotope and the 24.10% of an isotope with the mass 205.9759 amu. And the 22.10% of an isotope having the mass of 206.9759 amu. Or the 52.40% of an isotope which is having the mass of 207.9766 amu. Identify the element and determine the average atomic mass.