Abstract
Some metals readily form bonds to other atoms of the same element in molecular compounds, but others, such as zinc, are not known to do so. In his Perspective, [Parkin][1] highlights the discovery of a molecular compound with a zinc-zinc bond by [ Resa et al .][2] and places the discovery in the context of the other two elements in group 12 of the periodic table, cadmium and mercury. [1]: http://www.sciencemag.org/cgi/content/full/305/5687/1117 [2]: http://www.sciencemag.org/cgi/content/short/305/5687/1136
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