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Encyclopedia > Lanthanide series
Atomic No. Name Symbol
57 Lanthanum La
58 Cerium Ce
59 Praseodymium Pr
60 Neodymium Nd
61 Promethium Pm
62 Samarium Sm
63 Europium Eu
64 Gadolinium Gd
65 Terbium Tb
66 Dysprosium Dy
67 Holmium Ho
68 Erbium Er
69 Thulium Tm
70 Ytterbium Yb

The lanthanide series is the 14 rare earth chemical elements which lie between lanthanum and ytterbium on the periodic table. That is, they have atomic numbers between 57 and 70 inclusive. Below them are the actinides.


Lanthanides are elements in which the f orbitals are partly or completely filled, while the outermost p and d orbitals are empty. Since the f orbitals do not have as much effect on chemistry as the s, p, and d orbitals, lanthanide series elements are chemically similar to each other.


The lanthanides are typically placed below the main body of the periodic table in the manner of a footnote. The full-width version of the periodic table shows the position of the lanthanides more clearly.


External links

  • USGS Rare Earths Statistics and Information (http://minerals.usgs.gov/minerals/pubs/commodity/rare_earths/)

  Results from FactBites:
 
Composite dental cement composition containing a lanthanide series compound - Patent 5204398 (8477 words)
a lanthanide series compound which is not modified selected from the group consisting of an oxide and a carbonate in an amount between about 1 and 20 weight percent and being a powder having a particle size of between about 5 and 10 microns.
a lanthanide series compound which is not modified selected from the group consisting of an oxide and a carbonate in an amount between about 1 and 20 weight percent based on the combined amount of catalyst, base and lanthanide compound and being a powder having a particle size of between about 5 and 10 microns.
A lanthanide series compound is added to the inventive composite dental cement composition in order to interact with the polymer matrix (to push out air voids or to form a copolymerlike composition) for increasing compressive strength of the resulting composition, and for increasing wear of the overall inventive composition.
  More results at FactBites »


 

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