lanthanide

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Related to lanthanide series: actinide series, Transition metals

lan·tha·nide

(lăn′thə-nīd′)
n.
Any of the chemically related elements with atomic numbers 57 through 71. Also called rare earth, rare-earth element.
References in periodicals archive ?
From the above data, both Z = 57 and Z = 89 begin a sequence of f shells filling before d shells (Z = 57 is the beginning of the Lanthanide series and Z = 89 is beginning of the Actinide series).
Essentially constant properties across the lanthanide series dictate consistent corrosion inhibiting mechanisms and properties over the rare earth elements.
Rare earth elements--largely the lanthanide series at the bottom of the periodic table--show up in only minute concentrations in living creatures.