Chemical element with atomic number 58Àdàkọ:SHORTDESC:Chemical element with atomic number 58
Cerium, 58Ce |
| 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) |
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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 |
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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 | | at T (K) | 1992 | 2194 | 2442 | 2754 | 3159 | 3705 | |
| 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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 Color lines in a spectral rangeSpectral 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 |
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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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| 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 | β−β− | 1.417 | 142Nd | | 144Ce | syn | 284.893 days | β− | 0.319 | 144Pr | |
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