HARD-VS-SOFT-2

HARD-VS-SOFT-2 - chemical bond. But what electron shells...

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Unformatted text preview: chemical bond. But what electron shells are most deformable? To make a guess as to the answer to this question consider once again metals. In metals, a small voltage difference results in electrons travelling across the metal (ie., the metal conducts electrons). If electrons can move (almost) freely in a metal, they must be very deformable. (Professor Michael Sienko of Cornell studied the implications of these ideas forty years ago.) Let’s use this understanding to determine which p-shell elements have the squishiest electrons. We look at p-shell elements in their elemental form. Restricting our attention to groups 14 and 15 of the periodic table, we note that the group 14 elements with good conduction are Pb, Sn (especially in one of its two forms) and C (graphite). In group 15, Bi is the best conductor. We see that large atoms and multiple-bonded main group atoms have the most deformable of all electron shells....
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This note was uploaded on 03/01/2011 for the course CHEM 2090 taught by Professor Zax,d during the Winter '07 term at Cornell.

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