Cerium

Cerium (pípè /ˈsɪəriəm/) je apilese kemika to ni ami-idamo Ce ati nomba atomu 58.

Cerium, ₅₈Ce

Cerium
Pípè	/ˈsɪəriəm/ ​(SEER-ee-əm)
Ìhànsójú	silvery white
Ìwúwo átọ̀mù Ar, std(Ce)	140.116(1)
Cerium 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 - ↑ Ce ↓ Th lanthanum ← cerium → praseodymium
Nọ́mbà átọ̀mù (Z)	58
Ẹgbẹ́	group n/a
Àyè	àyè 6
Àdìpọ̀	Àdìpọ̀-f
Ẹ̀ka ẹ́límẹ́ntì	Lanthanide
Ìtò ẹ̀lẹ́ktrọ́nù	[Xe] 4f1 5d1 6s2
Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan	2, 8, 18, 19, 9, 2
Àwọn ohun ìní ara
Ìfarahàn at STP	solid
Ìgbà ìyọ́	1068 K ​(795 °C, ​1463 °F)
Ígbà ìhó	3716 K ​(3443 °C, ​6229 °F)
Kíki (near r.t.)	6.770 g/cm3
when liquid (at m.p.)	6.55 g/cm3
Heat of fusion	5.46 kJ/mol
Heat of	398 kJ/mol
Molar heat capacity	26.94 J/(mol·K)
pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 1992 2194 2442 2754 3159 3705
Atomic properties
Oxidation states	+1, +2, +3, +4 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment
Electronegativity	Pauling scale: 1.12
Atomic radius	empirical: 181.8 pm
Covalent radius	204±9 pm
Color lines in a spectral range Spectral lines of cerium
Other properties
Natural occurrence	primordial
Crystal structure	​(fcc)
Speed of sound thin rod	2100 m/s (at 20 °C)
Thermal expansion	(r.t.) (γ, poly) 6.3 µm/(m·K)
Thermal conductivity	11.3 W/(m·K)
Electrical resistivity	(r.t.) (β, poly) 828 n Ω·m
Magnetic ordering	paramagnetic
Young's modulus	(γ form) 33.6 GPa
Shear modulus	(γ form) 13.5 GPa
Bulk modulus	(γ form) 21.5 GPa
Poisson ratio	(γ form) 0.24
Mohs hardness	2.5
Vickers hardness	270 MPa
Brinell hardness	412 MPa
CAS Number	7440-45-1
Main isotopes of cerium
Iso­tope Abun­dance Half-life (t1/2) Decay mode Pro­duct 134Ce syn 3.16 days ε 0.500 134La 136Ce 0.185% 136Ce is stable with 78 neutrons 138Ce 0.251% 138Ce is stable with 80 neutrons 139Ce syn 137.640 days ε 0.278 139La 140Ce 88.450% 140Ce is stable with 82 neutrons 141Ce syn 32.501 days β− 0.581 141Pr 142Ce 11.114% > 5×1016 years β−β− 1.417 142Nd 144Ce syn 284.893 days β− 0.319 144Pr