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**Unformatted text preview: **Topics for the day • Administrative stuff, including Help before the exam • Exam One • Electron conFguration: remembering orbital ordering • Why are the orbitals ordered that way? • Isoelectronic • Effective nuclear charge • Atomic radii • Ionization energy • Homework problems Administrative stuff If you haven’t done so already, use your clicker today and then register it online at http://www.iclicker.com / Apologies for the change after class of making HW3/4 due by today. Answer keys on Quest once due time/date has passed. If you requested an early exam due to conFict with another course/exam, check your email. You need to respond to my email to be allowed to take the early exam tomorrow. Help before exam Exam review with Christine: TODAY, 2 - 4 pm, UTC 4.134 NO O¡¡ICE HOURS TONIGHT Of¢ce hours with Christine: Wednesday, 2 - 4 pm, Jester Download all HW answer keys from Quest Exam Review Sheet on Blackboard Page showing info available on scantron on Blackboard OfFce hours this week post exam Regular ofFce hours with DrRuth, Thu 4 - 5 pm DrRuth ¡RIDAY O¡¡ICE HOURS CANCELLED THIS WEEK (AISD holiday). Extra ofFce hour next week to make up. Monday 1 - 2 pm. Exam One! TOMORROW Wed 2/11, 7 - 9 pm, WEL 1.308. You will need: non-programmable calculator UT student ID card several #2 pencils empty bladder You may not leave before, or start after, 7:45 pm. Once you leave, you may not return. << 25% of the exam will be revision questions, such as given on HW1 and 2 The rest will be on Chapter 12 There are 30 questions. Some calculations. Some theory/concept stuff. Some easy. Some harder. You have two hours. Questions are randomized At start of time, scan through so there are no surprises. Mark the calculations, the easy ones, the ones you will have to think about. Note point values. Do the easy ones Frst. Put off the hardest ones til last. Keep track of time. Check and double check that you have correctly entered each answer on the scantron sheet, along with your EID, and your exam version #. Keep your copy of your exam Electron confguration: orbital order • The Aufbau principle adds electrons to the atomic orbitals one by one, starting at the orbital with the lowest energy not already fully occupied. • There are a number of ways to remember the order of the various energy levels: ns np (n–1)d (n–2)f n 1 2 3 4 5 6 7 1s 2s 2p 3s 3p 4s 4p 3d 5s 5p 4d 6p 6s 5d 4f 7s 6d 5f He Ne Ar Kr Xe Rn n 1 2 3 4 5 6 7 1s 2s 2p 3s 3p 4s 4p 3d 5s 4d Rh He Ne Ar Kr Xe Rn Build up all the electrons: 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 6 5s 2 4d 7 Or use rare gas shorthand: [Kr] Electron conFguration for Rhodium (Z=45)?...

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