Boron Naturally Occurs in Two Isotopic Forms

question 45

Multiple Choice

Boron naturally occurs in two isotopic forms. The more common isotope is ¹¹B (atomic mass 11.01 amu) , which is 80.00% abundant. The average atomic mass of boron is 10.81. What is the mass of the other isotope?

• A) 10.91 amu.
• B) 10.01 amu.
• C) 10.81 amu.
• D) 11.00 amu.
• E) 11.01 amu.

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