Reaching the Maximum Multiplicity of the Covalent Chemical Bond


  • This work was supported by the Swedish Natural Science Research Council (VR) and the Swedish Foundation for Strategic Research (SSF). L.G. thanks the Swiss National Science Foundation (grant no. 200021-111645/1) for support. A.C.B. acknowledges the continuous academic support from the CNPQ (Conselho Nacional de Desenvolvimento Científico e Tecnológico, Brazil) and FAPESP (Fundação de Amparo à Pesquisa do Estado de São Paulo, Brazil).


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Maxing out at six: The maximum bond order that can be achieved between two equal atoms in the periodic system is six. The picture shows the potential energy curves for the diatoms Cr2, Mo2, and W2, where the latter two are sextuply bonded molecules (d=internuclear distance in atomic units).