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Super bonding.

In "Small, but super" (SN: 6/21/08, p. 14), models of the superatoms are shown. I have a question on the first model (A14H7). You show hydrogen with two bonds. How can it have two single bonds with only one electron?

Skip Hackett, Tampa, Fla.

Indeed, hydrogen can't share electrons with more than one other atom at a time. The bonds in question are hydrogen bonds in which no electrons are shared, similar to the bonds between water molecules in ice. In this case, hydrogen atoms form two such bonds, acting as a bridge, says Shiv Khanna of Virginia Commonwealth University in Richmond. "In atom clusters, it is not unusual for hydrogen atoms to occupy a bridge site between two atoms/he says. --Davide Castelvecchi
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Title Annotation:FEEDBACK; hydrogen bonds
Author:Hackett, Skip; Castelvecchi, Davide
Publication:Science News
Article Type:Brief article
Geographic Code:1USA
Date:Sep 27, 2008
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