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:
A. there is an isotope of lanthanum with an atomic mass of 138.9
B. lanthanum-139 has the highest percent natural abundance
C. lanthanum-138 has the highest percent natural abundance
D. both isotopes have the same percent natural abundance
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Home » Chemistry » 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: A.