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Bromine has two naturally occurring isotope of Br-79 and Br-81 if the relative atomic mass of bromine 80, calculate the relative abudance of each isotope.

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An element has two naturally occurring isotopes. Isotope one has a mass of 120.9038 amu and a relative abundance of 57.4% and isotope to has a mass of 122.9042 amu. Find the atomic mass of this element.

Bromine has two occurring isotopes: 79Br with atomic mass 78.9183 and 81Br with atomic mass 80.9163. Without using a calculator, what would you estimate the % abundance of Br-79 to be?

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