The element has an atomic mass of 106.4679.
The average mass of an element's atoms expressed in atomic mass units is the term for an element's atomic mass (AMU, also known as daltons, D). The atomic mass, which represents a weighted average of all the isotopes of that element, is calculated by multiplying the mass of each isotope by its abundance.
A weighted average of masses of all natural isotopes of an element by their abundance
= First isotope mass × Relative abundance + Second isotope mass × Relative abundance/100
= 105.9041 × 71.82 × 107.9047 × 28.18/100
The atomic mass of the element = 106.4679 ama
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