An element has three stable isotopes. One has a mass number of 63 and an abundance of 50% The second has a mass number of 65 and an abundance of 30% The third has a mass number of 67 and an abundance of 20% Calculate the relative atomic mass of this element. Give your answer to one decimal place.

## Step1:To solve this problem, we first need to calculate the mass contribution of each isotope to the relative atomic mass of the element. Isotopes contributions can be calculated using this formula: (isotope mass) x (its relative abundance).## Step2:Next, we calculate the weighted isotopic mass for each of the three isotopes using the formula, converting the abundance percentage into a decimal by dividing it by 100.### ## Step3:After doing some multiplications, we sum up the extracted mass contributions to get the relative atomic mass.###