Template:Infobox lanthanum

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Lanthanum,  57La
Lanthanum-2.jpg
General properties
Name, symbol lanthanum, La
Pronunciation /ˈlænθənəm/
Appearance silvery white
Lanthanum in the periodic table
Hydrogen (diatomic nonmetal)
Helium (noble gas)
Lithium (alkali metal)
Beryllium (alkaline earth metal)
Boron (metalloid)
Carbon (polyatomic nonmetal)
Nitrogen (diatomic nonmetal)
Oxygen (diatomic nonmetal)
Fluorine (diatomic nonmetal)
Neon (noble gas)
Sodium (alkali metal)
Magnesium (alkaline earth metal)
Aluminium (post-transition metal)
Silicon (metalloid)
Phosphorus (polyatomic nonmetal)
Sulfur (polyatomic nonmetal)
Chlorine (diatomic nonmetal)
Argon (noble gas)
Potassium (alkali metal)
Calcium (alkaline earth metal)
Scandium (transition metal)
Titanium (transition metal)
Vanadium (transition metal)
Chromium (transition metal)
Manganese (transition metal)
Iron (transition metal)
Cobalt (transition metal)
Nickel (transition metal)
Copper (transition metal)
Zinc (transition metal)
Gallium (post-transition metal)
Germanium (metalloid)
Arsenic (metalloid)
Selenium (polyatomic nonmetal)
Bromine (diatomic nonmetal)
Krypton (noble gas)
Rubidium (alkali metal)
Strontium (alkaline earth metal)
Yttrium (transition metal)
Zirconium (transition metal)
Niobium (transition metal)
Molybdenum (transition metal)
Technetium (transition metal)
Ruthenium (transition metal)
Rhodium (transition metal)
Palladium (transition metal)
Silver (transition metal)
Cadmium (transition metal)
Indium (post-transition metal)
Tin (post-transition metal)
Antimony (metalloid)
Tellurium (metalloid)
Iodine (diatomic nonmetal)
Xenon (noble gas)
Caesium (alkali metal)
Barium (alkaline earth metal)
Lanthanum (lanthanide)
Cerium (lanthanide)
Praseodymium (lanthanide)
Neodymium (lanthanide)
Promethium (lanthanide)
Samarium (lanthanide)
Europium (lanthanide)
Gadolinium (lanthanide)
Terbium (lanthanide)
Dysprosium (lanthanide)
Holmium (lanthanide)
Erbium (lanthanide)
Thulium (lanthanide)
Ytterbium (lanthanide)
Lutetium (lanthanide)
Hafnium (transition metal)
Tantalum (transition metal)
Tungsten (transition metal)
Rhenium (transition metal)
Osmium (transition metal)
Iridium (transition metal)
Platinum (transition metal)
Gold (transition metal)
Mercury (transition metal)
Thallium (post-transition metal)
Lead (post-transition metal)
Bismuth (post-transition metal)
Polonium (post-transition metal)
Astatine (metalloid)
Radon (noble gas)
Francium (alkali metal)
Radium (alkaline earth metal)
Actinium (actinide)
Thorium (actinide)
Protactinium (actinide)
Uranium (actinide)
Neptunium (actinide)
Plutonium (actinide)
Americium (actinide)
Curium (actinide)
Berkelium (actinide)
Californium (actinide)
Einsteinium (actinide)
Fermium (actinide)
Mendelevium (actinide)
Nobelium (actinide)
Lawrencium (actinide)
Rutherfordium (transition metal)
Dubnium (transition metal)
Seaborgium (transition metal)
Bohrium (transition metal)
Hassium (transition metal)
Meitnerium (unknown chemical properties)
Darmstadtium (unknown chemical properties)
Roentgenium (unknown chemical properties)
Copernicium (transition metal)
Ununtrium (unknown chemical properties)
Flerovium (post-transition metal)
Ununpentium (unknown chemical properties)
Livermorium (unknown chemical properties)
Ununseptium (unknown chemical properties)
Ununoctium (unknown chemical properties)


La

Ac
bariumlanthanumcerium
Atomic number 57
Standard atomic weight 138.90547
Element category lanthanide, sometimes considered a transition metal
Group, block group n/a, f-block
Period period 6
Electron configuration [Xe] 5d1 6s2
per shell 2, 8, 18, 18, 9, 2
Physical properties
Phase solid
Melting point 1193 K ​(920 °C, ​1688 °F)
Boiling point 3737 K ​(3464 °C, ​6267 °F)
Density near r.t. 6.162 g·cm−3
liquid, at m.p. 5.94 g·cm−3
Heat of fusion 6.20 kJ·mol−1
Heat of vaporization 400 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 ​(a strongly basic oxide)
Electronegativity Pauling scale: 1.10
Ionization energies 1st: 538.1 kJ·mol−1
2nd: 1067 kJ·mol−1
3rd: 1850.3 kJ·mol−1
Atomic radius empirical: 187 pm
Covalent radius 207±8 pm
Miscellanea
Crystal structure hexagonal
Hexagonal crystal structure for lanthanum
Speed of sound thin rod, at 20 °C 2475 m·s−1
Thermal expansion α, poly: 12.1 µm·m−1·K−1 (at r.t.)
Thermal conductivity 13.4 W·m−1·K−1
Electrical resistivity α, poly: 615 nΩ·m (at r.t.)
Magnetic ordering paramagnetic[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 number 7439-91-0
History
Discovery Carl Gustaf Mosander (1838)
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% (SF) <38.944
Decay modes in parentheses are predicted, but have not yet been observed
· references

References

These references will appear in the article, but this list appears only on this page.
  1. ^ Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics. CRC press. 2000. ISBN 0849304814. 
Documentation icon Template documentation[view] [edit] [history] [purge]

Infoboxes for the chemical elements use the core template {{Infobox element}}.

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{{Periodic table (32 columns, micro)}}
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References

These references will appear in the article, but this list appears only on this page.
  1. ^ Endt, P. M. (1990). "Energy levels of A = 21–44 nuclei (VII)". Nuclear Physics A 521: 1–400. Bibcode:1990NuPhA.521....1E. doi:10.1016/0375-9474(90)90598-G. 
  2. ^ Chisté 2006.

See also[edit]

Index to chemical element infoboxes
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
1 1H
ibox E
2He
ibox E
2 3Li
ibox E
4Be
ibox E
5B
ibox E
6C
ibox E
7N
ibox E
8O
ibox E
9F
ibox E
10Ne
ibox E
3 11Na
ibox E
12Mg
ibox E
13Al
ibox E
14Si
ibox E
15P
ibox E
16S
ibox E
17Cl
ibox E
18Ar
ibox E
4 19K
ibox E
20Ca
ibox E
21Sc
ibox E
22Ti
ibox E
23V
ibox E
24Cr
ibox E
25Mn
ibox E
26Fe
ibox E
27Co
ibox E
28Ni
ibox E
29Cu
ibox E
30Zn
ibox E
31Ga
ibox E
32Ge
ibox E
33As
ibox E
34Se
ibox E
35Br
ibox E
36Kr
ibox E
5 37Rb
ibox E
38Sr
ibox E
39Y
ibox E
40Zr
ibox E
41Nb
ibox E
42Mo
ibox E
43Tc
ibox E
44Ru
ibox E
45Rh
ibox E
46Pd
ibox E
47Ag
ibox E
48Cd
ibox E
49In
ibox E
50Sn
ibox E
51Sb
ibox E
52Te
ibox E
53 I 
ibox E
54Xe
ibox E
6 55Cs
ibox E
56Ba
ibox E
1 asterisk 72Hf
ibox E
73Ta
ibox E
74W
ibox E
75Re
ibox E
76Os
ibox E
77Ir
ibox E
78Pt
ibox E
79Au
ibox E
80Hg
ibox E
81Tl
ibox E
82Pb
ibox E
83Bi
ibox E
84Po
ibox E
85At
ibox E
86Rn
ibox E
7 87Fr
ibox E
88Ra
ibox E
1 asterisk 104Rf
ibox E
105Db
ibox E
106Sg
ibox E
107Bh
ibox E
108Hs
ibox E
109Mt
ibox E
110Ds
ibox E
111Rg
ibox E
112Cn
ibox E
113Uut
ibox E
114Fl
ibox E
115Uup
ibox E
116Lv
ibox E
117Uus
ibox E
118Uuo
ibox E
8 119Uue
ibox E
120Ubn
ibox E
1 asterisk 57La
ibox E
58Ce
ibox E
59Pr
ibox E
60Nd
ibox E
61Pm
ibox E
62Sm
ibox E
63Eu
ibox E
64Gd
ibox E
65Tb
ibox E
66Dy
ibox E
67Ho
ibox E
68Er
ibox E
69Tm
ibox E
70Yb
ibox E
71Lu
ibox E
 
1 asterisk 89Ac
ibox E
90Th
ibox E
91Pa
ibox E
92U
ibox E
93Np
ibox E
94Pu
ibox E
95Am
ibox E
96Cm
ibox E
97Bk
ibox E
98Cf
ibox E
99Es
ibox E
100Fm
ibox E
101Md
ibox E
102No
ibox E
103Lr
ibox E
 
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