q1bsol - Lets check to see if the alleged isotopic...

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3.091 Fall Term 2004 Homework Quiz #1B Solution outline (a) Magnesium has three isotopes, 24 Mg, 25 Mg, and 26 Mg. For the cation, Mg 2+ , of the heaviest isotope, 26 Mg, specify the following: number of protons, n p = 12 number of electrons, n e = 10 number of neutrons, n n = 14 (b) An internet website is quoting the following values for the natural abundance of each isotope: 24 Mg 79% 25 Mg 10% 26 Mg 11% Does this distribution appear to be accurate? Explain with the aid of a simple calculation.
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Unformatted text preview: Lets check to see if the alleged isotopic distribution is consistent with the value of the atomic mass of Mg as given in your periodic table. (24 0.79) + (25 0.10) + (26 0.11) = 24.32 Your PT gives a value of 24.3050. Conclusion: the values posted at the internet website appear to be accurate....
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This note was uploaded on 11/02/2009 for the course CHEMISTRY 3.091 taught by Professor Donsadoway during the Fall '04 term at MIT.

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