title: All the lanthanides do it and even uranium does oxidation state +2.
authors.affiliation: Department für Chemie, Universität zu Köln, Greinstrasse 6, 50939 Köln (Germany) http://www.gerdmeyer.de; Department of Chemistry, Iowa State University, Ames, IA 50011 (USA). gerd.meyer@uni-koeln.de, ghmeyer@iastate.edu.
authors.forename: Gerd
authors.initials: G
authors.lastname: Meyer
keywords: lanthanides; oxidation state +2; reductive chemistry; uranium