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The atomic mass of element has been dependent on mass of each isotopes and their abundance in nature.
The atomic mass has been the mass of neutrons and protons of the element. There has been the presence of the isotopes of the elements, with varying abundance, and varying atomic masses.
The atomic mass of the element has been the relative average atomic mass of the element with respect to the mass of the isotopes and their percent abundance.
The average atomic mass (<em>amu</em>) has been given by:
Where, has been the atomic mass and abundance of isotope 1.
has been the atomic mass and abundance of isotope 2.
Thus, the average atomic mass has been dependent on mass of each isotopes and their abundance in nature.
For more information about the atomic mass, refer to the link: