03 HW - Isotopes

03 HW - Isotopes - Name: _ Date: _ WKST #5: Isotopes and...

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Name: __________________________________________ Date: ____________ WKST #5: Isotopes and Isotopic Abundance (30 points) Period: __________ 1. What is an isotope? Explain in terms of subatomic particles and atomic mass. 2. Why can’t isotopes of the same element have a different number of protons? 3. What differentiates 12 C, 13 C, and 14 C? 4. Complete the chart below using the periodic table Element Mass (amu) Protons Neutrons Electrons Mn 55 16 8 75 33 Ga 71 Au 198 5. Verify that the atomic mass of lithium is 6.94 amu, given the following information: 6 Li mass = 6.015 amu (exactly), percent abundance = 7.50% 7 Li mass = 7.016 amu (exactly), percent abundance = 92.50% 6. Thallium has two stable isotopes, Tl-203 and Tl-205. Which one is more abundant?
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This note was uploaded on 01/01/2012 for the course CHEM 101 taught by Professor Donahue during the Spring '11 term at Long Island U..

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03 HW - Isotopes - Name: _ Date: _ WKST #5: Isotopes and...

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