Lanthanum
57La
- ↑ La ↓ Ac Periodic table barium ← lanthanum → cerium
Panagway
silvery white
Kinatibuk-ang mga kinaiya
Ngalan, simbolo, kaiphan	lanthanum, La, 57
Paglitok	/ˈlænθənəm/
Kategoriyang elemento	puthaw nga lantanido sometimes considered a transition metal
Group, period, block	n/a, 6, f
Gibug-aton sa atomo	138.90547
Kontorno sa elektron	[Xe] 5d1 6s2 2, 8, 18, 18, 9, 2
History
Pagkadiskobre	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
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
v t e · 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.

1. ↑ Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics (PDF). CRC press. 2000. ISBN 0849304814.