In a periodic table the average atomic mass of magnesium is given  | Filo
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Class 12

Biology

Cell: Structure and Functions

Nuclei

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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  (23.98504u),  (24.98584u) and  (25.98259u). The natural abundance of  is 78.99% by mass. Calculate the abundances of other two isotopes.

Solution: Let, the abundance of by mass be x%.

Therefore, abundance of by mass=%%

Now, average atomic mass of Mg is

% for

% % for
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