Question

An element has four isotopes, each differing by an atomic mass of 1. The ratio of their abundance from the lightest to heaviest isotope is 1:2:2:3, respectively. Determine the average atomic mass of the element, if the mass of the heaviest isotope is A.

• A. $A+\frac{1}{8}$
• B. $A-\frac{9}{8}$
• C. $A-\frac{3}{8}$
• D. $A-\frac{1}{8}$

Answer 1

The correct option is B $A-\frac{9}{8}$