Chemistry - Isotopes 0.0 / 5 ? ChemistryAtomsGCSEAQA Created by: Who.The.Hell.Is.BuckyCreated on: 18-05-18 22:41 What is an isotope? Atoms of the same element with different number of neutrons. The atomic number remains the same however the atomic mass changes. 1 of 5 What is relative atomic mass? Average mass of different isotopes in an element. 2 of 5 How do you work out relative abundance? (mass of first isotope x % of first isotope) + (mass of second isotope x % of second isotope) Then divide result by 100 3 of 5 Work out the relative atomic mass of chlorine when there are 75% Cl-35 and 25% Cl-37 35.5 (working out on page 27 of collins chemistry txtbook) 4 of 5 Why can we not work out the average normally ( (x + y)/2) Because the abundance is not split equally (50%) 5 of 5
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