Template:Infobox lanthanum

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Lanthanum, 57La
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Lanthanum
Pronunciation/ˈlænθənəm/ (LAN-thə-nəm)
Appearancesillery white
Standard atomic weight Ar, std(La)138.90547(7)[1]
Lanthanum in the periodic cairt
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Airn Cobalt Nickel Capper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Siller (element) Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gowd Mercur (element) Thallium Leid (element) Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Ununtrium Flerovium Ununpentium Livermorium Ununseptium Ununoctium
-

La

Ac
bariumlanthanumcerium
Atomic nummer (Z)57
Groupgroup 3
Periodperiod 6
Blockf-block
Element category  Lanthanide
Electron confeeguration[Xe] 5d1 6s2
Electrons per shell2, 8, 18, 18, 9, 2
Pheesical properties
Phase at STPsolit
Meltin pynt1193 K ​(920 °C, ​1688 °F)
Bylin pynt3737 K ​(3464 °C, ​6267 °F)
Density (near r.t.)6.162 g/cm3
when liquid (at m.p.)5.94 g/cm3
Heat o fusion6.20 kJ/mol
Heat o vapourisation402.1 kJ/mol
Molar heat capacity27.11 J/(mol·K)
Vapour pressur (extrapolated)
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 2005 2208 2458 2772 3178 3726
Atomic properties
Oxidation states0,[2] +1, +2, +3 strangly basic
ElectronegativityPauling scale: 1.10
Atomic radiusempirical: 187 pm
Covalent radius207±8 pm
Colour lines in a spectral range
Colour lines in a spectral range
Spectral lines o lanthanum
Ither properties
Naitural occurrenceprimordial
Creestal structurhexagonal
Hexagonal creestal structur for lanthanum
Speed o soond thin rod2475 m/s (at 20 °C)
Thermal expansion(r.t.) (α, poly) 12.1 µm/(m·K)
Thermal conductivity13.4 W/(m·K)
Electrical resistivity(r.t.) (α, poly) 615 n Ω·m
Magnetic orderinparamagnetic[3]
Young's modulus(α form) 36.6 GPa
Shear modulus(α form) 14.3 GPa
Bulk modulus(α form) 27.9 GPa
Poisson ratio(α form) 0.280
Mohs haurdness2.5
Vickers haurdness491 MPa
Brinell haurdness363 MPa
CAS Nummer7439-91-0
History
DiskiveryCarl Gustaf Mosander (1838)
Main isotopes o lanthanum
Iso­tope Abun­dance Hauf-life (t1/2) Decay mode Pro­duct
137La syn 6×104 y ε 137Ba
138La 0.090% 1.05×1011 y ε 138Ba
β 138Ce
139La 99.910% - (SF)
Decay modes in parentheses are predicted, but hisna yet been observed
| references
style="text-align:left"|
in calc from C diff report ref
C 920
K 1193 1190 3 delta
F 1688 1690 -2 delta
WD Edit this at Wikidata
input C: 920, K: 1193, F: 1688
comment
style="text-align:left"|
in calc from C diff report ref
C 3464
K 3737 3737 0
F 6267 6267 0
WD Edit this at Wikidata
input C: 3464, K: 3737, F: 6267
comment

References

  1. Meija, Juris; et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry. 88 (3): 265–91. doi:10.1515/pac-2015-0305.
  2. Yttrium and all lanthanides except Ce, Pm, Eu, Tm, Yb have been observed in the oxidation state 0 in bis(1,3,5-tri-t-butylbenzene) complexes, see Cloke, F. Geoffrey N. (1993). "Zero Oxidation State Compounds of Scandium, Yttrium, and the Lanthanides". Chem. Soc. Rev. 22: 17–24. doi:10.1039/CS9932200017.
  3. Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics (PDF). CRC press. 2000. ISBN 0849304814.