What is the reason for the different atomic masses of the isotopes of an element ?

The atomic mass of an element is the weighted average of the atomic masses of different isotopes of that element .This explains,why atomic masses of many elements show large departures from integer values.However ,even if we consider msases of individual isotpes,they are not strictly integer multiples of the mass of a hydroen atom.How do yo account for this fact?

What is the mass of one atom of C(atomic mass 14)

Define atomic mass of an element.

Would you place the two isotopes of chlorine CI-35 and CI-37 because of their different atomic masses or in the same slot because their chemical properties are the same? Justify your answer

What are isotopes?