Chemistry, 22.10.2020 22:01, mamabates181981

The element lanthanum has an isotope with an atomic mass of 138.9 amu and an abundance of 99.91%. A second isotope has an atomic mass of 1379 amu and an abundance of 0.09%. What is
the average atomic mass of lanthanum?
138.4 amu
138.8 amu
138.9 amu
139.0 amu

Answers: 2

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The element lanthanum has an isotope with an atomic mass of 138.9 amu and an abundance of 99.91%. A...