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Cerium |
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Pípè | /ˈsɪəriəm/ (SEER-ee-əm) |
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Ìhànsójú | silvery white |
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Ìwúwo átọ̀mù Ar, std(Ce) | 140.116(1)[1] |
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Cerium ní orí tábìlì àyè |
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|
Nọ́mbà átọ̀mù (Z) | 58 |
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Ẹgbẹ́ | group n/a |
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Àyè | àyè 6 |
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Àdìpọ̀ | Àdìpọ̀-f |
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Ẹ̀ka ẹ́límẹ́ntì | Lanthanide |
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Ìtò ẹ̀lẹ́ktrọ́nù | [Xe] 4f1 5d1 6s2[2] |
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Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan | 2, 8, 18, 19, 9, 2 |
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Àwọn ohun ìní ara |
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Ìfarahàn at STP | solid |
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Ìgbà ìyọ́ | 1068 K (795 °C, 1463 °F) |
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Ígbà ìhó | 3716 K (3443 °C, 6229 °F) |
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Kíki (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 of fusion | 5.46 kJ/mol |
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Heat of | 398 kJ/mol |
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Molar heat capacity | 26.94 J/(mol·K) |
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pressure
P (Pa)
|
1
|
10
|
100
|
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 | +1, +2, +3, +4 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment |
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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 of cerium |
Other properties |
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Natural occurrence | primordial |
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Crystal structure | (fcc) |
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Speed of sound 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 ordering | 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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Bulk modulus | (γ form) 21.5 GPa |
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Poisson ratio | (γ form) 0.24 |
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Mohs hardness | 2.5 |
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Vickers hardness | 270 MPa |
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Brinell hardness | 412 MPa |
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CAS Number | 7440-45-1 |
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Main isotopes of cerium |
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Àdàkọ:Category-inline | references |