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Europium |
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Pípè | /jʊəˈroʊpiəm/ (yoor-OH-pee-əm) |
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Ìhànsójú | silvery white, but rarely seen without oxide discoloration |
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Ìwúwo átọ̀mù Ar, std(Eu) | 151.964(1)[1] |
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Europium ní orí tábìlì àyè |
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|
Nọ́mbà átọ̀mù (Z) | 63 |
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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] 4f7 6s2 |
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Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan | 2, 8, 18, 25, 8, 2 |
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Àwọn ohun ìní ara |
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Ìfarahàn at STP | solid |
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Ìgbà ìyọ́ | 1099 K (826 °C, 1519 °F) |
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Ígbà ìhó | 1802 K (1529 °C, 2784 °F) |
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Kíki (near r.t.) | 5.264 g/cm3 |
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when liquid (at m.p.) | 5.13 g/cm3 |
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Heat of fusion | 9.21 kJ/mol |
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Heat of | 176 kJ/mol |
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Molar heat capacity | 27.66 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)
|
863
|
957
|
1072
|
1796
|
|
|
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|
Atomic properties |
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Oxidation states | +1, +2, +3 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment |
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Electronegativity | Pauling scale: ? 1.2 |
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Atomic radius | empirical: 180 pm |
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Covalent radius | 198±6 pm |
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Spectral lines of europium |
Other properties |
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Natural occurrence | primordial |
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Crystal structure | (bcc) |
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Thermal expansion | (r.t.) (poly) 35.0 µm/(m·K) |
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Thermal conductivity | est. 13.9 W/(m·K) |
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Electrical resistivity | (r.t.) (poly) 0.900 µ Ω·m |
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Magnetic ordering | paramagnetic[2] |
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Young's modulus | 18.2 GPa |
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Shear modulus | 7.9 GPa |
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Bulk modulus | 8.3 GPa |
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Poisson ratio | 0.152 |
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Vickers hardness | 167 MPa |
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CAS Number | 7440-53-1 |
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Main isotopes of europium |
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Àdàkọ:Category-inline | references |