lanthanide series definition of lanthanide series in the Free Online Encyclopedia.

lanthanide series, a series of metallic elements, included in the rare-earth metals rare-earth metals, in chemistry, group of metals including those of the lanthanide series and actinide series, usually yttrium, sometimes scandium and thorium, and rarely zirconium.
..... Click the link for more information. , in Group 3 of the periodic table periodic table, chart of the elements arranged according to the periodic law discovered by Dmitri I. Mendeleev and revised by Henry G. J. Moseley. In the periodic table the elements are arranged in columns and rows according to increasing atomic number (see the table
..... Click the link for more information. . Members of the series are often called lanthanides, although lanthanum lanthanum [Gr.,=to lie hidden], metallic chemical element; symbol La; at. no. 57; at. wt. 138.9055; m.p. about 920°C;; b.p. about 3,460°C;; sp. gr. 6.19 at 25°C;; valence +3.
..... Click the link for more information. (atomic number 57) is not always considered a member of the series. The series always includes the 14 elements with atomic numbers 58 through 71, which are (in order of increasing atomic number) cerium cerium [from the asteroid Ceres], metallic chemical element; symbol Ce; at. no. 58; at. wt. 140.12; m.p. 799°C;; b.p. 3,426°C;; sp. gr. 6.77 at 25°C;; valence +3 or +4.
..... Click the link for more information. , praseodymium praseodymium [Gr., =green twin], metallic chemical element; symbol Pr; at. no. 59; at. wt. 140.9077; m.p. 931°C;; b.p. 3,512°C;; sp. gr. about 6.8; valence +3 or +4. Praseodymium is a soft, malleable, ductile, silver-yellow metal.
..... Click the link for more information. , neodymium neodymium , metallic chemical element; symbol Nd; at. no. 60; at. wt. 144.24; m.p. about 1,021°C;; b.p. about 3,068°C;; sp. gr. 7.004 at 20°C;; valence +3. Neodymium is a lustrous silver-yellow metal.
..... Click the link for more information. , promethium promethium , artificially produced radioactive chemical element; symbol Pm; at. no. 61; mass no. of most stable isotope 145; m.p. 1,042°C;; b.p. 3,000°C; (estimated); sp. gr. unknown; valence +3.
..... Click the link for more information. , samarium samarium , metallic chemical element; symbol Sm; at. no. 62; at. wt. 150.36; m.p. 1,072°C;; b.p. 1,791°C;; sp. gr. 7.54 at 20°C;; valence +2 or +3. Samarium is a lustrous silver-white metal.
..... Click the link for more information. , europium europium [from Europe], metallic chemical element; symbol Eu; at. no. 63; at. wt. 151.96; m.p. about 820°C;; b.p. about 1,600°C;; sp. gr. 5.25 at 25°C;; valence +2 or +3. Europium is a ductile silvery-white metal; it is both rare and expensive.
..... Click the link for more information. , gadolinium gadolinium , metallic chemical element; symbol Gd; at. no. 64; at. wt. 157.25; m.p. 1,312°C;; b.p. 3,233°C;; sp. gr. 7.898 at 25°C;; valence +3. Gadolinium is a malleable, ductile, lustrous silver-white metal with a hexagonal close-packed crystalline
..... Click the link for more information. , terbium terbium [from Ytterby, a village in Sweden], metallic chemical element; symbol Tb; at. no. 65; at. wt. 158.9254; m.p. 1,356°C;; b.p. 3,123°C;; sp. gr. about 8.25; valence +3 or +4. Terbium is a soft, malleable, ductile, silver-gray metal.
..... Click the link for more information. , dysprosium dysprosium [Gr.,=hard to get at], metallic chemical element; symbol Dy; at. no. 66; at. wt. 162.50; m.p. 1,412°C;; b.p. 2,562°C;; sp. gr. 8.54 at 25°C;; valence+3. Dysprosium is a lustrous silvery metal; it is very soft and can be cut with a knife.
..... Click the link for more information. , holmium holmium [Lat.,=Stockholm], metallic chemical element; symbol Ho; at. no. 67; at. wt. 164.9304; m.p. about 1,474°C;; b.p. about 2,425°C;; sp. gr. 8.78 at 25°C;; valence +3.
..... Click the link for more information. , erbium erbium [from Ytterby, a town in Sweden], metallic chemical element; symbol Er; at. no. 68; at. wt. 167.26; m.p. 1,529°C;; b.p. 2,863°C;; sp. gr. 9.05 at 25°C;; valence +3. Erbium is a soft, malleable, lustrous, silvery metal.
..... Click the link for more information. , thulium thulium [from Thule, an ancient name for Scandinavia], metallic chemical element; symbol Tm; at. no. 69; at. wt. 168.9342; m.p. about 1,545°C;; b.p. 1,947°C;; sp. gr. 9.3; valence +3. Thulium is a soft, malleable, ductile, lustrous silver-white metal.
..... Click the link for more information. , ytterbium ytterbium [for Ytterby, a town in Sweden], metallic chemical element; symbol Yb; at. no. 70; at. wt. 173.04; m.p. 819°C;; b.p. about 1,194°C;; sp. gr. about 7.0; valence +2 or +3. Ytterbium is a soft, malleable, ductile, lustrous silver-white metal.
..... Click the link for more information. , and lutetium lutetium, formerly lutecium , metallic chemical element; symbol Lu; atomic number 71; at. wt. 174.967; m.p. about 1,663°C;; b.p. about 3,395°C;; sp. gr. 9.835 at 25°C;; valence +3.
..... Click the link for more information. . All of the members of the series very closely resemble lanthanum and one another in their chemical and physical properties; as the atomic number increases in this series, added electrons enter the 4f electron orbital. Chemically, they are about as reactive as calcium. They all form trivalent compounds; some also form divalent or tetravalent compounds. The lanthanides have similiar sizes so that any given compound of the rare earths is likely to crystallize with the same structure as any other rare earth; however, the lattice parameters become smaller and the crystal denser as compounds proceed across the series.

lanthanide series [′lan·thə‚nīd ‚sir·ēz]

(chemistry)

Rare-earth elements of atomic numbers 57 through 71; their chemical properties are similar to those of lanthanum, atomic number 57.

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No references found			The elements themselves comprise the lanthanide series of elements on the Periodic Table, and although they respectively have a whole bunch of names that are hard to pronounce, (never mind spell), they're not as rare as their collective name implies. Rare earth elements: driving home a new industry by Moen, Keith / SaskBusiness Rare earth elements--largely the lanthanide series at the bottom of the periodic table--show up in only minute concentrations in living creatures. Fossil fingerprints: rare earths tie bones to burial ground by Lock, C. / Science News INTRODUCTION Heavy metal complexes from the lanthanide series (i. Thermophysical Properly Modifications in Functional Polymers via ... by BELFIORE, LAURENCE A.; RUZMAIKINA, IZOLDA Y.; DAS, PRONAB K. / Polymer Engineering and Science			Lansky, Meyer Lanson, Gustave Lansquenets Lanston, Tolbert lantana LANtastic lantern lantern clock lantern cross Lantern Festival lantern fish lantern jaw lantern light Lantern Night at Bryn Mawr College lantern pinion lantern ring lantern skylight lantern slide Lantern-Pinion Gearset lantern-type chimney lanterne des morts Lanterns Festival lanthana lanthanide lanthanide contraction lanthanide series Lanthanides lanthanite Lanthanosuchus Lanthanotus Borneensis lanthanum lanthanum nitrate lanthanum oxide lanthanum sesquioxide lanthanum sulfate lanthanum trioxide lanthanum-doped lead zirconate-lead titanate Lanthonotidae lanthorne Lantier, Etienne Lantse Lantz, Walter Lanugo Lanus Lanús Lanuvium lanyard Lanza, Mario Lanzarote Lanzhou Lao			Lanterna magica Lanterna magica lanterne des morts Lanterneye fish lanternfish lanternfish lanternfish lanternfish lanternfishes lanternfishes lanternfly lanterns lanterns lanterns Lanterns Festival Lanterns on the Lake Lantex Manufacturing Company Limited Lantfleet Information Management System LANTFLT LANTFLTWPNTRAFAC Lanthana lanthanide lanthanide lanthanide lanthanide Lanthanide contraction Lanthanide metal Lanthanide metal Lanthanide metal Lanthanide metal lanthanide series Lanthanides Lanthanides Lanthanides Lanthanides Lanthanides series Lanthanides series Lanthanides series Lanthanides series Lanthanite Lanthanite lanthanoid lanthanoid lanthanoid lanthanoid Lanthanoid series elements Lanthanoid series elements Lanthanoid series elements Lanthanoid series elements Lanthanoids Lanthanoids Lanthanoids Lanthanoids lanthanon Lanthanosuchus Lanthanotidae Lanthanotidae Lanthanotus Lanthanotus borneensis Lanthanotus borneensis lanthanum