Lec-14-Chap-07-5 - CHE 131 Lecture 14, 2/22/2006 Periodic...

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CHE 131 Lecture 14, 2/22/2006 1 Periodic Trends Lecture fourteen (Chapter seven) Benjamin S. Hsiao Department of Chemistry Stony Brook University Lewis Electron Dot Structures Magnetism • result of the spin of electrons • diamagnetism - no unpaired electrons • paramagnetism - one or more unpaired electrons • ferromagentism - case of paramagnetism where the substance retains its magnetism Magnetism
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CHE 131 Lecture 14, 2/22/2006 2 Trends in the Periodic Table • atomic radius • ionic radius • ionization energy • electron affinity Atomic Radius • decrease left to right across a period – as nuclear charge increases, number of electrons increase; however, the nucleus acts as a unit charge while the electrons act independently, pulling electrons towards the nucleus, decreasing size Atomic Radius • increase top to bottom down a group – each additional electron “shell” shields the outer electrons from the nuclear charge Z eff = Z - S where Z eff effective nuclear charge Z
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This note was uploaded on 09/04/2009 for the course CHE 81914-01 taught by Professor Prof.benjaminhsiao during the Spring '06 term at SUNY Stony Brook.

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Lec-14-Chap-07-5 - CHE 131 Lecture 14, 2/22/2006 Periodic...

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