bioex_lect9 - MIT OpenCourseWare http:/ 5.111...

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MIT OpenCourseWare 5.111 Principles of Chemical Science Fall 2008 For information about citing these materials or our Terms of Use, visit: .
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Periodic Trends (or Organization of the Periodic Table) See lectures 9 and 10 for an introduction to periodic trends. Elements within the same group of the periodic table have related valence electron configurations and many similar properties. For example: Li, Na, and K (group 1A) all have one valence electron and are all soft, reactive metals. He, Ne, and Ar (group 8A) all have filled valence shells and are inert. In the late 1800s, the similar chemical properties of related atoms were believed to an extreme. Figure by MIT OpenCourseWare Today, in contrast, we understand that the differences between elements within a given group (many of which may be predicted by periodic trends) are as significant as the similarities. Example
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This note was uploaded on 03/02/2012 for the course CHEM 5111 taught by Professor Vogel during the Fall '08 term at MIT.

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bioex_lect9 - MIT OpenCourseWare http:/ 5.111...

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