The relative atomic mass of lithium can be calculated by the average weighted of masses of the Isotopes of lithium relative to the mass of lithium.
Relative atomic mass of an element is given in the periodic table. It is also called relative atomic weight. The relative atomic mass of an element is the weighted average of the masses of the isotopes in the naturally occurring element relative to the mass of an atom.
We can estimate the the relative atomic mass or the atomic weight of an element E with the naturally occurring isotopes and with the respective abundances of A%, B%, C% and like that.
relative atomic mass =( A /100× a)+ ( B / 100× b) + ( C/100 × c).... and so on
lithium has two isotopes. one is lithium-6 and other is lithium-7 . so we can calculate the relative atomic mass by using Isotopes of lithium.
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