Question

An element consists of 62.60% of an isotope with mass 186.956 u and 37.40% of an isotope with mass 184.953 u. Calculate the average atomic mass and identify the element from periodic table

Answer 1

Atomic mass = {(62.60x186.956)/100}+{(37.40x184.953)/100}

=186.206.

From the periodic table, the element is Rhenium.