Cerium

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Cerium
58Ce
-

Ce

Th
lanthanumceriumpraseodymium
Ìhànsójú
silvery white
Àwọn ìdámọ́ wíwọ́pọ̀
Orúkọ, àmì-ìdámọ́, nọ́mbà cerium, Ce, 58
Ẹ̀ka ẹ́límẹ̀nti lanthanide
Ẹgbẹ́, àsìkò, àdìpò n/a6, f
Ìwúwo átọ́mù 140.116
Ìtòléra ẹ̀lẹ́ktrónì [Xe] 4f2 6s2
2, 8, 18, 19, 9, 2
Physical properties
Phase solid
Density (near r.t.) 6.770 g·cm−3
Liquid density at m.p. 6.55 g·cm−3
Melting point 1068 K, 795 °C, 1463 °F
Boiling point 3716 K, 3443 °C, 6229 °F
Heat of fusion 5.46 kJ·mol−1
Heat of vaporization 398 kJ·mol−1
Molar heat capacity 26.94 J·mol−1·K−1
Vapor 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 4, 3, 2
(mildly basic oxide)
Electronegativity 1.12 (Pauling scale)
Ionization energies 1st: 534.4 kJ·mol−1
2nd: 1050 kJ·mol−1
3rd: 1949 kJ·mol−1
Atomic radius 181.8 pm
Covalent radius 204±9 pm
Miscellanea
Crystal structure face-centered cubic
Cerium has a face-centered cubic crystal structure
Magnetic ordering paramagnetic[1]
Electrical resistivity (r.t.) (β, poly) 828 nΩ·m
Thermal conductivity 11.3 W·m−1·K−1
Thermal expansion (r.t.) (γ, poly) 6.3 µm/(m·K)
Speed of sound (thin rod) (20 °C) 2100 m·s−1
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 registry number 7440-45-1
Àwọn ísótòpù dídúró jùlọ
Main article: Àwọn ísótòpù cerium
iso NA half-life DM DE (MeV) DP
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
· r

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


Itokasi[àtúnṣe | àtúnṣe àmìọ̀rọ̀]

  1. Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.