Cerium

Cerium
58Ce
- ↑ Ce ↓ Th Tábìlì ìdásìkò lanthanum ← cerium → praseodymium
Ìhànsójú
silvery white
Àwọn ìdámọ́ wíwọ́pọ̀
Orúkọ, àmì-ìdámọ́, nọ́mbà	cerium, Ce, 58
Ẹ̀ka ẹ́límẹ̀nti	lanthanide
Ẹgbẹ́, àsìkò, àdìpò	n/a, 6, 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
Magnetic ordering	paramagnetic
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 β−β− 1.417 142Nd 144Ce syn 284.893 days β− 0.319 144Pr

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