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The element lanthanum has two stable isotopes, lanthanum-138 with an atomic mass of 137.9 amu and lanthanum-139 with an atomic mass of 138.9 amu. From the atomic weight of La = 138.9 one can conclude that: there is an isotope of lanthanum with an atomic mass of 138.9? lanthanum-139 has the highest percent natural abundance? lanthanum-138 has the highest percent natural abundance? both isotopes have the same percent natural abundance? Which ones are true?

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