Question: Rubidium has two naturally occurring isotopes, rubidium-85 (atomic mass = 84.9118 amu; abundance = 72.15% and rubidium-87 (atomic mass = 86.9092 amu; abundance = 27.85%.

Rubidium has two naturally occurring isotopes, rubidium-85 (atomic mass = 84.9118 amu; abundance = 72.15% and rubidium-87 (atomic mass = 86.9092 amu; abundance = 27.85%. Calculate the atomic weight of rubidium.

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