The next most abundent isotope is 26mg, relative atomic, Ask an Expert

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Naturally ocurring magnesium has an atomic mass of 24.312 and consists of three isotopes. the major isotope is 24Mg, natural abundence 78.99%, relative atomic mass 23.98504. The next most abundent isotope is 26Mg, relative atomic mass 25.98259. The third Isotope is 25Mg whose natural abundance is in the ratio of 0.9083 to that of 26Mg. What is the relative atomic mass of 25Mg?

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