The relative atomic mass of the atom of an element is known as [[1]].

Average atomic mass takes into isotopic abundance . For-example: the most abundant isotope of carbon is carbon_12, which has a relative abundance of (98.89%). The atomic masses of carbon-13 and carbon-14 are 13.003 amu and 14.003 amu. The average atomic mass of carbon is 12.011. So, the relative atomic mass of the atom of an element is known as average atomic mass.