Compare with actinide and inner transition metals. Elements 57-70 are called lanthanides. Electrons added during the Aufbau construction of lanthanide atoms go into the 4f subshell.
Found op http://antoine.frostburg.edu/chem/senese/101/glossary/l.shtml
The lanthanide or lanthanoid (IUPAC nomenclature) series comprises the fifteen metallic chemical elements with atomic numbers 57 through 71, from lanthanum through lutetium. These fifteen lanthanide elements, along with the chemically similar elements scandium and yttrium, are often collectively kn...
Found op http://en.wikipedia.org/wiki/Lanthanide
Any member of a group of rare, metallic elements with atomic numbers from 57 (lanthanum) to 71 (lutetium) inclusive, in which the 4f orbitals are being filled. The lanthanides are: lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolini...
Found op http://www.daviddarling.info/encyclopedia/L/lanthanide.html
The lanthanides are a group of 15 elements.
Found op http://www.probertencyclopaedia.com/browse/GL.HTM
Any of a series of 15 metallic elements (also known as rare earths) with atomic numbers 57 (lanthanum) to 71 (lutetium). One of its members, promethium, is radioactive. All occur in nature. Lanthanides are grouped because of their chemical similarities (most are trivalent, but some can be divalent o...
Found op http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0010050.html
1) Group 2) Grouping 3) Lanthanoid 4) Lanthanon 5) Rare earth 6) Rare-earth element 7) The lanthanides are a group of 15 elements
Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/lanthanide/1
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