Question

difine atomic weight in a element​

Answer 1

Atomic weight is average weight of all the isotopes of an element available in nature whereas Atomic mass is mass of one atom expressed in amu (atomic mass unit).

Answer 2

Answer:

Atomic weight, also called relative atomic mass, ratio of the average mass of a chemical element's atoms to some standard. Since 1961 the standard unit of atomic mass has been one-twelfth the mass of an atom of the isotope carbon-12. ... Atomic weight is measured in atomic mass units (amu), also called daltons.