Respuesta :
The relative mass of the bromine is calculated by Average weighted mass of bromine relative to the mass of the bromine.
You can measure the mass of one isotope of the element (isotopic mass) or you can take a sample of the element that has multiple isotopes in it and calculate the mean average atomic mass of the sample (average atomic mass) . 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)
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