Question: The element gallium has two stable isotopes: 69 Ga with an atomic mass of 68.92 u and 71 Ga with an atomic mass of 70.92

The element gallium has two stable isotopes: ⁶⁹Ga with an atomic mass of 68.92 u and ⁷¹Ga with an atomic mass of 70.92 u. A periodic table shows that the chemical atomic mass of gallium is 69.72 u. What is the percent abundance of ⁶⁹Ga?

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