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Related to lanthanide series: actinide series, Transition metals


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).
c] plateaus appear to follow a trend anticipated from the dependence of the ionic radius on the number of f electrons as R progresses across the lanthanide series.