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Le-19 has an atomic mass of 19.0134u, Le-17 has an atomic mass of 17.4629u, and Le-15 has an atomic mass of 15.7384u. Use the natural

Le-19 has an atomic mass of 19.0134u, Le-17 has an atomic mass of 17.4629u, and Le-15 has an atomic mass of 15.7384u. Use the natural abundance and atomic mass of each isotope to determine the average atomic mass of Le

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