<P> Relative atomic mass ( symbol : A ) , or atomic weight , is a dimensionless ( number only ) physical quantity . In its modern definition , it is the ratio of the average mass of atoms of an element ( in a given sample ) to one unified atomic mass unit . </P>
<P> Relative atomic mass ( symbol : A ) , or atomic weight , is a dimensionless ( number only ) physical quantity . In its modern definition , it is the ratio of the average mass of atoms of an element ( in a given sample ) to one unified atomic mass unit . </P>
the average of the masses of all the atoms in a sample of an element is called
the average of the masses of all the atoms in a sample of an element is called
Relative atomic mass atomic weight
Relative atomic mass atomic weight