Atomic mass o an element should properly be called average atomic mass. Explain.

Atomic mass of an element is

Atomic mass of an element is

Define average atomic mass

Atomic mass of the element Sulphur-

Define Average atomic mass ?

Define atomic mass 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?