Lanthanum

Lanthanum (pípè /ˈlænθənəm/) je apilese kemika to ni ami-idamo La ati nomba atomu 57.

Lanthanum, ₅₇La

Lanthanum
Pípè	/ˈlænθənəm/ ​(LAN-thə-nəm)
Ìhànsójú	silvery white
Ìwúwo átọ̀mù Ar, std(La)	138.90547(7)
Lanthanum ní orí tábìlì àyè
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 Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver 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 Gold Mercury (element) Thallium Lead 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 Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Y ↑ La ↓ Ac barium ← lanthanum → cerium
Nọ́mbà átọ̀mù (Z)	57
Ẹgbẹ́	group 3
Àyè	àyè 6
Àdìpọ̀	Àdìpọ̀-f
Ẹ̀ka ẹ́límẹ́ntì	Lanthanide
Ìtò ẹ̀lẹ́ktrọ́nù	[Xe] 5d1 6s2
Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan	2, 8, 18, 18, 9, 2
Àwọn ohun ìní ara
Ìfarahàn at STP	solid
Ìgbà ìyọ́	1193 K ​(920 °C, ​1688 °F)
Ígbà ìhó	3737 K ​(3464 °C, ​6267 °F)
Kíki (near r.t.)	6.162 g/cm3
when liquid (at m.p.)	5.94 g/cm3
Heat of fusion	6.20 kJ/mol
Heat of	402.1 kJ/mol
Molar heat capacity	27.11 J/(mol·K)
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	0, +1, +2, +3 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment
Electronegativity	Pauling scale: 1.10
Atomic radius	empirical: 187 pm
Covalent radius	207±8 pm
Spectral lines of lanthanum
Other properties
Natural occurrence	primordial
Crystal structure	​hexagonal
Speed of sound thin rod	2475 m/s (at 20 °C)
Thermal expansion	(r.t.) (α, poly) 12.1 µm/(m·K)
Thermal conductivity	13.4 W/(m·K)
Electrical resistivity	(r.t.) (α, poly) 615 n Ω·m
Magnetic ordering	paramagnetic
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
Main isotopes of lanthanum
Iso­tope Abun­dance Half-life (t1/2) Decay mode Pro­duct 137La syn 60,000 yrs ε 0.600 137Ba 138La 0.09% 1.05×1011yrs ε 1.737 138Ba β− 1.044 138Ce 139La 99.91% 139La is stable with 82 neutrons