Europium

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Europium
63Eu
-

Eu

Am
samariumeuropiumgadolinium
Ìhànsójú
silvery white, but rarely seen without oxide discoloration
Àwọn ìdámọ́ wíwọ́pọ̀
Orúkọ, àmì-ìdámọ́, nọ́mbà europium, Eu, 63
Ìpèlóhùn /jʊˈroʊpiəm/, yoo-ROH-pee-əm
Ẹ̀ka ẹ́límẹ̀nti lanthanide
Ẹgbẹ́, àsìkò, àdìpò n/a6, f
Ìwúwo átọ́mù 151.964
Ìtòléra ẹ̀lẹ́ktrónì [Xe] 4f76s 2
2, 8, 18, 25, 8, 2
Physical properties
Phase solid
Density (near r.t.) 5.264 g·cm−3
Liquid density at m.p. 5.13 g·cm−3
Melting point 1099 K, 826 °C, 1519 °F
Boiling point 1802 K, 1529 °C, 2784 °F
Heat of fusion 9.21 kJ·mol−1
Heat of vaporization 176 kJ·mol−1
Molar heat capacity 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    
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
Europium has a body-centered cubic crystal structure
Magnetic ordering paramagnetic[1]
Electrical resistivity (r.t.) (poly) 0.900 µΩ·m
Thermal conductivity 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
Àwọn ísótòpù dídúró jùlọ
Main article: Àwọn ísótòpù europium
iso NA half-life DM DE (MeV) DP
150Eu syn 36.9 y ε 2.261 150Sm
151Eu 47.8% 5×1018 y α   147Pm
152Eu syn 13.516 y ε 1.874 152Sm
β 1.819 152Gd
153Eu 52.2% 153Eu is stable with 90 neutrons
· r


Itokasi[àtúnṣe | àtúnṣe àmìọ̀rọ̀]

  1. Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.