课程名称︰普通化学甲上 课程教师︰林万寅 开课学院：工学院 开课系所︰化学工程学系 考试日期（年月日）︰2011/10/21 考试时限（分钟）：约15分钟 是否需发放奖励金：是 （如未明确表示，则不予发放） 试题 : Five stable isotopes of zirconium (Z = 40) have the following atomic masses and abundances. Answer the following questions. Isotope % abundance Atomic mass 90Zr ? 89.910 91Zr 11.27 90.906 92Zr 17.17 91.905 94Zr 17.73 93.906 96Zr 2.78 95.908 1. Define the terms: atomic number, mass number, and isotope. 15% 2. What is the abundance of 90Zr? 5% 3. Give the number of protons for 91Zr. 5% 4. Give the number of neutrons for 92Zr. 5% 5. Give the number of electrons for 94Zr. 5% 6. Give the number of protons, neutrons, and electrons for 96Zr3+. 15% 7. Calculate the atomic mass of Zr. 15% 8. The existence of subatomic particles and isotopes indicates that some postulates in Dalton’s atomic theory are incorrect. What are they? 20% 9. Draw the mass spectrum for Zr. 15% --

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