Rubidium has two naturally occurring isotopes, rubidium-85 (atomic mass = 84.9118 amu; abundance = 72.15%) and rubidium-87 (atomic mass = 86.909) amu; abundance = 27.85%). Calculate the atomic weight of rubidium.

Chemistry: Matter and Change
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Chapter4: The Structure Of The Atom
Section4.3: How Atoms Differ
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 Rubidium has two naturally occurring isotopes, rubidium-85 (atomic mass = 84.9118 amu; abundance = 72.15%) and rubidium-87 (atomic mass = 86.909) amu; abundance = 27.85%). Calculate the atomic weight of rubidium.

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