Europium
Lát'ọwọ́ Wikipedia, ìwé ìmọ̀ ọ̀fẹ́
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| Ìfarahàn |
silvery white, but rarely seen without oxide discoloration
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| Àwọn ìní àníkárí |
| Orúkọ, àmì-ìdámọ̀, nọ́mbà |
europium, Eu, 63 |
| Ìpè |
/jʊˈroʊpiəm/, yoo-ROH-pee-əm |
| Ẹ̀ka apilẹ̀sẹ̀ |
lanthanide |
| Àdìpọ̀, ìgbà, block |
n/a, 6, f |
| Ìwúwo átọ́mù |
151.964 g·mol−1 |
| Ìtòjọ ẹ̀lẹ́ktrónì |
[Xe] 4f76s 2 |
| Àwọn ẹ̀lẹ́ktrónì lórí ọ̀nà kan |
2, 8, 18, 25, 8, 2 (Image) |
| Àwọn ìní aláfójúrí |
| Phase |
solid |
| Kíki (tó súnmọ́ r.t.) |
5.264 g·cm−3 |
| Liquid density at m.p. |
5.13 g·cm−3 |
| ojúàmì ìyọ́ |
1099 K, 826 °C, 1519 °F |
| ajúàmì ìhó |
1802 K, 1529 °C, 2784 °F |
| Heat of fusion |
9.21 kJ·mol−1 |
| Heat of vaporization |
176 kJ·mol−1 |
| Specific heat capacity |
(25 °C) 27.66 J·mol−1·K−1 |
| Vapor pressure |
| P/Pa |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T/K |
863 |
957 |
1072 |
1796 |
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| Atomic properties |
| Oxidation states |
3, 2 (mildly basic oxide) |
| Electronegativity |
? 1.2 (Pauling scale) |
| Ionization energies |
1st: 547.1 kJ·mol−1 |
| 2nd: 1085 kJ·mol−1 |
| 3rd: 2404 kJ·mol−1 |
| Atomic radius |
180 pm |
| Covalent radius |
198±6 pm |
| Miscellanea |
| Crystal structure |
body-centered cubic |
| Magnetic ordering |
paramagnetic[1] |
| Electrical resistivity |
(r.t.) (poly) 0.900 µΩ·m |
| Thermal conductivity |
(300 K) est. 13.9 W·m−1·K−1 |
| Thermal expansion |
(r.t.) (poly)
35.0 µm/(m·K) |
| Young's modulus |
18.2 GPa |
| Shear modulus |
7.9 GPa |
| Bulk modulus |
8.3 GPa |
| Poisson ratio |
0.152 |
| Vickers hardness |
167 MPa |
| CAS registry number |
7440-53-1 |
| Most stable isotopes |
| Main article: Isotopes of europium |
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