Boron, which has an average atomic mass of 10.81 amu, has two stable isotopes: boron-10 and boron-11.Boron-10 has an atomic mass of 10.0129 amu and a natural abundance of 19.78%.What is the atomic mass of boron-11?

Name: Boron, which has an average atomic mass of 10.81 amu, has two stable isotopes: boron-10 and boron-11.Boron-10 has an atomic mass of 10.0129 amu and a natural abundance of 19.78%.What is the atomic mass of boron-11?
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$ (0.1978)(10.0129)+(0.8022)(x)=10.81 \mathrm{amu} $

Boron, Which Has an Average Atomic Mass of 10