Carbon can exceed four-bond limit.

The article discusses research on how carbon connects to other atoms. It references a study by Dean Tantillo et al and published in the January 2, 2017 issue of "Angewandte Chemie." Topics covered include the finding that carbon atom bonds to six other carbon atoms, an exception to carbon's textbook four-bond limit, the study's discovery about a molecule called hexamethylbenze, and other exceptions to carbon's four-bond limit identified by the study.