Gallium has an average atomic mass of 69.8 u, made of gallium-69 and gallium-71. Taking each mass as its mass number, what percentage of the atoms are gallium-71?

ChemistryHardHigh School (11–12)Structure of the Atom › Isotopes and Isobars

Gallium has an average atomic mass of $69.8\ \text{u}$ , made of gallium-69 and gallium-71. Taking each mass as its mass number, what percentage of the atoms are gallium-71?

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