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Homework 2 - fernandez(jf23742 Homework 2 Brodbelt(53765...

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fernandez (jf23742) – Homework 2 – Brodbelt – (53765) 1 This print-out should have 12 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. This assignment covers electromagnetic ra- diation and atomic structure. The due date is September 17, 2008, at 11:00 pm. 001 10.0 points How many moles of electrons would there be in one mole of He 2+ ? 1. 2 mol 2. 1 mol 3. none 4. 4 mol 5. 0.5 mol 002 10.0 points The atomic weight of a newly discovered el- ement is 10.600 amu. It has two naturally occuring isotopes. One has a mass of 10.000 and a natural abundance of 70.000%. What is the isotopic mass of the other isotope? 1. 10.600 2. 11.000 3. 10.000 4. 11.200 5. 10.500 6. 9.0000 7. 11.500 8. 9.5000 9. 12.000 003 10.0 points How many protons and electrons are present in the Mg 2+ ion? 1. 14 protons, 10 electrons 2. 12 protons, 10 electrons 3. 12 protons, 12 electrons 4. 12 protons, 14 electrons 5. 10 protons, 12 electrons 6. 14 protons, 12 electrons 7. 10 protons, 10 electrons 8. 14 protons, 14 electrons 9. 10 protons, 14 electrons 004 10.0 points A 200 nm photon has how many times the energy of a 700 nm photon?
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