Question

In a periodic table the average atomic mass of magnesium is given as 24.312 u. The average value is based on their relative natural abundance on earth. The three isotopes and their masses are ²⁴₁₂Mg and (25.98259u). ²⁵₁₂Mg The natural abundance of ²⁴₁₂Mg is 78.99% by mass. Calculate the abundances of other two isotopes.

Answer 1

Average atomic mass of magnesium, m = 24.312 u

Hence, the abundance of ²⁵₁₂Mg is 9.3% and that of ²⁶₁₂Mg is 11.71%.