9-14-11-PT - Understanding the Periodic Table Lynn A....

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Unformatted text preview: Understanding the Periodic Table Lynn A. Melton University of Texas at Dallas September 14, 2011 9-14-11 1 Exams and Quizzes • Quiz #2 – deadline Thursday September 15 • Exam #1 – Tuesday September 20, 7:15 – 8:45 pm, room assignments TBA 9-14-11 2 Re-visit the Bohr Model • What is good about the Bohr model? – It works for H atoms. – It provides a nice picture of the structure of an atom and explains discrete spectral lines. • What is bad about the Bohr model? – It only works for H atoms. – It provides a nice picture of orbits that makes it hard for students to learn to think about (diffuse) orbitals. 9-14-11 3 Re-visit the Bohr Model 9-14-11 4 Understanding the Periodic Table 9-14-11 5 Understanding the Periodic Table Who is this man and why is he smiling? 9-14-11 6 Understanding the Periodic Table • How many elements are on planet Xanadu? Do they fit into a periodic table? • Foam Atoms Bonding Weight – – – – – – 9-14-11 1 2 3 4 5 6 Fuzz velcro Fuzz velcro Hook velcro Fuzz velcro Fuzz velcro Hook velcro 7.82 7.54 7.71 1.54 7.69 1.75 7 Understanding the Periodic Table • http://www.ptable.com/ 9-14-11 8 Understanding the Periodic Table • Characteristic Chemistry – Metals • Neutrals – bulk metals, conduct heat and electricity • Ions – in aqueous solutions, positive ions – Noble gases • Do not form compounds (almost) – Halogens • Neutrals form diatomic molecules • Ions – in aqueous solution, negative ions 9-14-11 9 Understanding the Periodic Table • Characteristic Chemistry – Other non-metals (C,N, O, S, P) • Neutrals – little effect on aqueous solutions, but opens up “organic chemistry” and the “chemistry of life” • Ions – combine with oxygen to produce negatively charged ions that are important in aqueous solutions, – Metalloids 9-14-11 • Occupy the border between Metals and Other nonmetals -- mixed properties 10 Understanding the Periodic Table Next time • Charges – how does the balance between positive and negative charges work out? • Valence – chemistry from configurations • Trends – one way to deal with too much information! 9-14-11 11 ...
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This note was uploaded on 10/15/2011 for the course MISC. 101 taught by Professor Multiple during the Fall '11 term at University of Texas at Dallas, Richardson.

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9-14-11-PT - Understanding the Periodic Table Lynn A....

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