Chemistry Isotopes Solution: Magnesium has three naturally occurring isotopes: ...

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Solution: Magnesium has three naturally occurring isotopes: 24 Mg (23.985 amu) with 78.99% abundance, 25 Mg (24.986 amu) with 10.00% abundance, and a third with 11.01% abundance.Look up the atomic weight of magnesium, and then calculate the mass of the third isotope.