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Using two different full-potential ab-initio techniques we introduce asimple, universal rule based on the number of broken first-neighbor bonds todetermine the surface energies of the three noble metals Cu, Ag and Au. When abond is broken, the rearrangement of the electronic charge for these metalsdoes not lead to a change of the remaining bonds. Thus the energy needed tobreak a bond is independent of the surface orientation. This novel finding canlead to the development of simple models to describe the energetics of asurface like step and kink formation, crystal growth, alloy formation,equilibrium shape of mesoscopic crystallites and surface faceting.Comment: 4 pages, 2 figure

Broken-bond rule for the surface energies of noble metals