ch43-p004 - (the symbol for which, coincidentally, is Y)....

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4. We note that the sum of superscripts (mass numbers A ) must balance, as well as the sum of Z values (where reference to Appendix F or G is helpful). A neutron has Z = 0 and A = 1. Uranium has Z = 92. (a) Since xenon has Z = 54, then “Y” must have Z = 92 – 54 = 38, which indicates the element Strontium. The mass number of “Y” is 235 + 1 – 140 – 1 = 95, so “Y” is 95 Sr. (b) Iodine has Z = 53, so “Y” has Z = 92 – 53 = 39, corresponding to the element Yttrium
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Unformatted text preview: (the symbol for which, coincidentally, is Y). Since 235 + 1 139 2 = 95, then the unknown isotope is 95 Y. (c) The atomic number of Zirconium is Z = 40. Thus, 92 40 2 = 52, which means that X has Z = 52 (Tellurium). The mass number of X is 235 + 1 100 2 = 134, so we obtain 134 Te. (d) Examining the mass numbers, we find b = 235 + 1 141 92 = 3....
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This note was uploaded on 05/19/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.

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