Account for the following limit your answer to two sentence Atomic weight of most of the elements are fraction ?

Explanation

Most of the elements are found in nature maximum of isotopes which have difference atomic masses .Therefore, the atomic mass of any element is the average of the atomic masses of isotopes of that element
Example: ltbegt Given that the qabsandance of isotopes `^(54)Fe,^(58)Fe` and `^(17)Fe is 5% , 90 % and 5%` respectively , the atomic mass of Fe is calculate as follows:
Atomic mass of into ` = ((5 xx 54) + (90 xx 56) + (5 xx 57))/(100)`
`= 55.95`