A naturally occurring sample of an element contains only two isotopes. The first isotope has a mass of 68.9255 amu and a natural abundance of 60.11%. The second isotope has a mass of 70.9247 amu. Use this information to answer the following questions. Calculate the atomic mass of the element, to 4 significant figures. Include the unit, amu, in your answer below. Give the full name for the element that exists as these two isotopes. Explain how you determined the element name in the above question.
