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General properties |
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Appearance | sillery white |
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Staundart atomic wecht (Ar, staundart) | 7002140116000000000♠140.116(1)[1] |
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Cerium in the periodic cairt |
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Atomic nummer (Z) | 58 |
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Group | group n/a |
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Period | period 6 |
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Element category | lanthanide |
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Block | f-block |
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Electron confeeguration | [Xe] 4f1 5d1 6s2[2] |
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Electrons per shell | 2, 8, 18, 19, 9, 2 |
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Pheesical properties |
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Phase (at STP) | solit |
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Meltin pynt | 1068 K (795 °C, 1463 °F) |
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Bylin pynt | 3716 K (3443 °C, 6229 °F) |
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Density (near r.t.) | 6.770 g/cm3 |
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when liquid (at m.p.) | 6.55 g/cm3 |
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Heat o fusion | 5.46 kJ/mol |
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Heat o vapourisation | 398 kJ/mol |
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Molar heat capacity | 26.94 J/(mol·K) |
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Vapour pressur
P (Pa)
|
1
|
10
|
100
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1 k
|
10 k
|
100 k
|
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at T (K)
|
1992
|
2194
|
2442
|
2754
|
3159
|
3705
|
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Atomic properties |
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Oxidation states | 4, 3, 2, 1 (mildly basic oxide) |
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Electronegativity | Pauling scale: 1.12 |
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Atomic radius | empirical: 181.8 pm |
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Covalent radius | 204±9 pm |
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Spectral lines o Cerium |
Miscellanea |
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Creestal structur | face-centred cubic (fcc) |
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Speed o soond thin rod | 2100 m/s (at 20 °C) |
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Thermal expansion | (r.t.) (γ, poly) 6.3 µm/(m·K) |
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Thermal conductivity | 11.3 W/(m·K) |
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Electrical resistivity | (r.t.) (β, poly) 828 n Ω·m |
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Magnetic orderin | paramagnetic[3] |
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Young's modulus | (γ form) 33.6 GPa |
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Shear modulus | (γ form) 13.5 GPa |
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Bouk modulus | (γ form) 21.5 GPa |
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Poisson ratio | (γ form) 0.24 |
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Mohs haurdness | 2.5 |
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Vickers haurdness | 270 MPa |
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Brinell haurdness | 412 MPa |
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CAS Nummer | 7440-45-1 |
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History |
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Namin | efter dwarf planet Ceres, itsel named efter Roman deity o agricultur Ceres |
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Diskivery | Martin Heinrich Klaproth, Jöns Jakob Berzelius, Wilhelm Hisinger (1803) |
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First isolation | Carl Gustaf Mosander (1839) |
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Main isotopes o cerium |
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Decay modes in parentheses is predict, but hisna yet been observed |
| references | in Wikidata |