Gallium Has an Atomic Mass of 69

question 90

Multiple Choice

Gallium has an atomic mass of 69.723 u. The abundance of Ga-69 (68.926 u) is 60.11%. What is the atomic mass, in u, of the other isotope?

• A) 70.92 u
• B) 70.93 u
• C) 70.94 u
• D) 70.91 u
• E) 70.930 u

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Historical Pattern

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AASB 137

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