The element having the same atomic number is said to have been called isotopes. The element with five isotopes and atomic mass ranging from 45 - 49 amu is Gadolinium (Gd).
An isotope is an element that has a different number of neutrons in its nucleus but has the same atomic number because there is no change in the number of protons or electrons in the elemental atom.
The average atomic mass of the element will be calculated by adding the products of the mass number and the percent natural abundance as,
45.95269 × 0.80 = 36.762152
46.951764 × 0.730 = 34.274787
47.947947 × 0.738 = 35.385584
48.947841 × 0.550 = 26.921312
49.944792 × 0.540 = 26.970187
Adding the products as,
= 36.762152 + 34.274787 + 35.385584 + 26.921312 + 26.970187
= 160.314022
The element with an atomic mass of 160 is Gadolinium (Gd).
Therefore, the element is Gadolinium (Gd).
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