Lantano

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Lanthanum
57La
-

La

Ac
bariumlanthanumcerium
Appearance
silvery white
General properties
Name, simbolo, kaiphan lanthanum, La, 57
Pronunciation Plantilya:IPAc-en
Element category puthaw nga lantanido
sometimes considered a transition metal
Group, period, block n/a6, f
Standard atomic weight 138.90547
Electron configuration [Xe] 5d1 6s2
2, 8, 18, 18, 9, 2
Electron shells of lanthanum (2, 8, 18, 18, 9, 2)
History
Discovery Carl Gustaf Mosander (1838)
Physical properties
Phase magahi
Density (near r.t.) 6.162 g·cm−3
Liquid density at m.p. 5.94 g·cm−3
Melting point 1193 K, 920 °C, 1688 °F
Boiling point 3737 K, 3464 °C, 6267 °F
Heat of fusion 6.20 kJ·mol−1
Heat of vaporization 402.1 kJ·mol−1
Molar heat capacity 27.11 J·mol−1·K−1
Vapor pressure (extrapolated)
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 2005 2208 2458 2772 3178 3726
Atomic properties
Oxidation states 3, 2 (strongly basic oxide)
Electronegativity 1.10 (Pauling scale)
Ionization energies 1st: 538.1 kJ·mol−1
2nd: 1067 kJ·mol−1
3rd: 1850.3 kJ·mol−1
Atomic radius 187 pm
Covalent radius 207±8 pm
Miscellanea
Crystal structure hexagonal
Lanthanum has a hexagonal crystal structure
Magnetic ordering paramagnetic[1]
Electrical resistivity (r.t.) (α, poly) 615 nΩ·m
Thermal conductivity 13.4 W·m−1·K−1
Thermal expansion (r.t.) (α, poly) 12.1 µm/(m·K)
Speed of sound (thin rod) (20 °C) 2475 m·s−1
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 hardness 2.5
Vickers hardness 491 MPa
Brinell hardness 363 MPa
CAS registry number 7439-91-0
Most stable isotopes
Main article: Isotopes of lanthanum
iso NA half-life DM DE (MeV) DP
137La syn 6×104 y ε 0.600 137Ba
138La 0.090% 1.05×1011 y ε 1.737 138Ba
β 1.044 138Ce
139La 99.910% 139La is stable with 82 neutrons
t  h  u
· r

Ang lantano (Iningles lanthanum) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga La ug kaiphan nga atomik 57. Ang lantano mao ang puthaw nga lantanido.

Ang mga gi basihan niini[usba | edit source]

  1. Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics, CRC press. 2000. ISBN 0849304814, http://www-d0.fnal.gov/hardware/cal/lvps_info/engineering/elementmagn.pdf. 


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