Cerium

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Cerium, 58Ce
Cerium2.jpg
Cerium
Pípè /ˈsɪəriəm/ (SEER-ee-əm)
Ìhànsójúsilvery white
Ìwúwo átọ̀mù Ar, std(Ce)140.116(1)[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
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Ce

Th
lanthanumceriumpraseodymium
Nọ́mbà átọ̀mù (Z)58
Ẹgbẹ́group n/a
Àyèàyè 6
Àdìpọ̀Àdìpọ̀-f
Ẹ̀ka ẹ́límẹ́ntì  Lanthanide
Ìtò ẹ̀lẹ́ktrọ́nù[Xe] 4f1 5d1 6s2[2]
Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan2, 8, 18, 19, 9, 2
Àwọn ohun ìní ara
Ìfarahàn at STPsolid
Ìgbà ìyọ́1068 K ​(795 °C, ​1463 °F)
Ígbà ìhó3716 K ​(3443 °C, ​6229 °F)
Kíki (near r.t.)6.770 g/cm3
when liquid (at m.p.)6.55 g/cm3
Heat of fusion5.46 kJ/mol
Heat of 398 kJ/mol
Molar heat capacity26.94 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
ElectronegativityPauling scale: 1.12
Atomic radiusempirical: 181.8 pm
Covalent radius204±9 pm
Color lines in a spectral range
Spectral lines of cerium
Other properties
Natural occurrenceprimordial
Crystal structure ​(fcc)
Face-centered cubic crystal structure for cerium
Speed of sound thin rod2100 m/s (at 20 °C)
Thermal expansion(r.t.) (γ, poly) 6.3 µm/(m·K)
Thermal conductivity11.3 W/(m·K)
Electrical resistivity(r.t.) (β, poly) 828 n Ω·m
Magnetic orderingparamagnetic[3]
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 hardness2.5
Vickers hardness270 MPa
Brinell hardness412 MPa
CAS Number7440-45-1
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 ββ 1.417 142Nd
144Ce syn 284.893 days β 0.319 144Pr
Àdàkọ:Category-inline
| references

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


Itokasi[àtúnṣe | àtúnṣe àmìọ̀rọ̀]

  1. Meija, Juris; Coplen, Tyler B.; Berglund, Michael; Brand, Willi A.; De Bièvre, Paul; Gröning, Manfred; Holden, Norman E.; Irrgeher, Johanna et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry 88 (3): 265–91. doi:10.1515/pac-2015-0305. 
  2. Ground levels and ionization energies for the neutral atoms, NIST
  3. Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.