lanthanides lanthanum elements praseodymium europium neodymium lutetium gadolinium ytterbium cerium the periodic table oxides lanthanide series Lanthanides samarium lanthanide elements atomic number metal free encyclopedia mixture metals dictionary promethium compounds Chemistry Ln element rare earths minerals oxygen erbium yttrium lanthanide ions trivalent ionic radius complexes Chemistry of the Elements unpaired electrons decreases ions electrons compound glass Palm International lanthanoid polish chloride nitrate acetate periodic table salts thulium monazite sand terbium discovery new element Swedish chemist Elements Rare Earth Chemicals dysprosium rare earth metals rare-earth metals Welsbach products oxide background information Element Groups Tb Samarium ligands ceramic characteristics nonmetals earth elements element chemistry Mischmetall burn strongly subcategories Namespaces recent changes online dictionary læn search Wikimedia Commons Variants Personal tools common properties Interaction Languages non-profit organization Dysprosium Lanthanum Lutetium Europium anomaly chemical elements earth rare-earth element subgroup Cerium dioxide Toolbox holmium Encyclopedia cells thesaurus browser nucleus Department of Chemistry synonyms visualization Lanthanoid series elements Free Online Dictionary antonyms travels atomic numbers alloys catalysts H2 rare earth compounds commodity rare earth elements substance monazite Cerium oxide damage DNA lanthanide contraction 4f metallic radius f orbitals relativistic effects transition elements Bettencourt relativity shield Xe phosphors University of Nevada, Reno Dias group Exceptions electronic configuration Cerium