Atomic mass : This is the average relative mass of atom of element  as compared with the carbon atom -12 isotope taken as 12.

        
Average atomic mass : If an elements exists in the two isotopes having atomic masses 'a' and 'b' in the ratio   m : n, then the average atomic mass =   Since the atomic mass is a ratio, it has no units and can be expressed in amu, 1 amu = 1.66 * 10^-24g. One atomic mass unit (amu) is equal to    of mass of an atom of the carbon-12 isotope.

Gram atomic mass (GAM) : The atomic mass of an element expressed in grams is termed as Gram atomic mass or gram atom or mole atom.

         (i) Number of gram atoms     

         (ii) Mass of an element in gm. = No. of gm. atom * GAM

         (iii) Number of atoms in 1 GAM = 6.02 * 10²³

                Number of atoms in a given substance

         = No. of  GAM * 6.02 *  10²³  = 

         (iv) Number of atoms in 1gm of element   

         (v) Mass of one atom of the element (in gm.)   

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