1) Group 2) Grouping 3) Lanthanoid 4) Lanthanon 5) Rare earth 6) Rare-earth element 7) Rare-earth series
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1) Lanthanoid 2) Lanthanon
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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.
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http://antoine.frostburg.edu/chem/senese/101/glossary/l.shtml
The lanthanide d or lanthanoid d series of chemical elements 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 known as the rare earth elements. The informal c...
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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...
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http://www.daviddarling.info/encyclopedia/L/lanthanide.html
The lanthanides are a group of 15 elements.
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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 or tetravalent), their properties differing only sl...
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https://www.encyclo.co.uk/local/21221
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