Elements are found in different isotopic forms (atoms of same elements having different atomic mass), so the atomic mass of any element is the average of all the isotopic mass within a given sample.
(A) If an elements exists in two isotopes having atomic masses ‘M1’ and ‘M2’ in the ratio X: Y, then
or
(B) If an elements exists in two isotopes having atomic masses ‘M1’ and ‘M2’ and their abundant percentage (%) are X % and Y % then
Since the atomic mass is a ratio, it has no units and is expressed in amu.
Illustrative Examples:
No comments:
Post a Comment