Explain what is the atomic mass of lanthanum

Reference no: EM13184065

The element lanthanum has an atomic weight of 139 and consists of two stable isotopes lanthanum-138 and lanthanum-139.

The isotope lanthanum-138 has an atomic mass of 138 amu and a percent natural abundance of 8.90E-2 %.
The isotope lanthanum-139 has a percent natural abundance of 99.9 %.

What is the atomic mass of lanthanum-139?

Reference no: EM13184065

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