SEARCH Articles Figures Tables Electron Configurations of the Lanthanides and f Orbitals Electron tunneling in processes of F-centre decay Electronic spectra of f electron systems Excited states of f electron systems F-electron bonding F-electron delocalization F-electron dependence F-electron hybridization F-electron magnetism F-electron metals F-electron systems Relativistic All-Electron Approaches to the Study of f Element Chemistry THE CHALLENGE OF d AND f ELECTRONS Transition Metals Have Electron Configurations with Incomplete d or f Shells Unpaired f electrons