The atomic mass of Ga is 69.72 amu. There are only two naturally occurring isotopes of gallium:
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The atomic mass of Ga is 69.72 amu. There are only two naturally occurring isotopes of gallium: 69Ga, with a mass of 69.0 amu, and 71Ga, with a mass of 71.0 amu. The natural abundance of the 69Ga isotope is approximately:
a. 15%
b. 30%
c. 50%
d. 65%
e. 80%
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