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Unformatted text preview: Cheung, Anthony Exam 1 Due: Sep 27 2006, 1:00 pm Inst: McCord 1 This print-out should have 21 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points How many electrons can possess this set of quantum numbers: n = 3, spin quantum num- ber m s = +1/2. 1. 10 2. 18 3. 3 4. 4 5. 1 6. 8 7. 2 8. 9 correct 9. 6 10. 7 Explanation: For n = 3 there is 1 s orbital 3 p orbitals and 5 d orbitals. This gives a total of 9 orbitals. Each orbital can hold two electrons, which gives 18 electrons. Half of the 18 electrons will have a spin of + 1/2 and the other half will have a spin of - 1/2. Therefore a total of 9 electrons can possess this set of quantum numbers. 002 (part 1 of 1) 10 points In general, ionization energy tends to increase in the periodic table 1. from bottom to top and from left to right. correct 2. from bottom to top and from right to left. 3. from top to bottom and from left to right. 4. from top to bottom and from right to left. 5. in no regular trend. Explanation: In general, atomic radii decrease from left to right and increase from top to bottom of the Periodic Table. The smaller the atom, the more energy is required to remove an electron. 003 (part 1 of 1) 10 points Arrange the following types of photons of elec- tromagnetic radiation in order of decreasing energy: red light, radio, x-rays, -rays, in- frared. 1. -rays > x-rays > radio > infrared > red light 2. -rays > x-rays > red light > infrared > radio correct 3. radio > red light > infrared > x-rays > -rays 4. x-rays > -rays > red light > infrared > radio 5. x-rays > red light > infrared > -rays > radio Explanation: 004 (part 1 of 1) 12 points Cobalt-60 ( 60 27 Co) is an artificial radioisotope that is produced in a nuclear reactor for use as a gamma-ray source in the treatment of certain types of cancer. If the wavelength of the gamma radiation from a cobalt-60 source is 1 . 00 10- 3 nm, calculate the energy of a...
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- Fall '07