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Unformatted text preview: one with a mass number of 79. The atomic weight reported on the periodic table for this element is 76.7. What is the percent abundance of each isotope? 6. Neon has three isotopes. Two of these are shown below with their percent abundance. Ne-20 90.92% Ne-22 8.82% What is the mass of the third isotope of neon? CH301 Isotope Calculation Extra Practice Problems Answers 1. 24.3247 amu Close, but not exactly same as periodic table value Possible reasons: Each isotope probably has a slightly different mass than our estimates of 24, 25, and 26 amu. The percentages used for the periodic table value were probably more precise. 2. B-11 80.4% 10.814 amu 3. Li-6 5.9% Li-7 94.1% 4. X-50 38% X-52 62% Yes – should be more of the X-52 based on the known atomic weight 5. X-76 76.7% X-79 23.3% 6. 21.27 amu...
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