rubidium-85: atomic mass = 84.9118 amu f.a. = 72.15% ÷ 100 = 0.7215
rubidium-87: atomic mass = 86.9092 amu f.a. = 27.85% ÷ 100 = 0.2785
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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