General | States | Energies | Oxidation & Electrons |Appearance & Characteristics
Reactions | Other Forms |Radius | Conductivity | Abundance
Encyclopedia Britannica articles


Name Europium Symbol Eu
atomic number 63 Atomic weight 151.96
Density @ 293 K 5.259 g/cm3 Atomic volume 28.9 cm3/mol
Group Rare Earth discovered 1901


state (s, l, g) s
melting point 1095.2 K boiling point 1712 K
Heat of fusion 9.210 kJ/mol Heat of vaporization 143.50 kJ/mol
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1st ionization energy 546.7 kJ/mole electronegativity 1.12
2nd ionization energy 1085 kJ/mole electron affinity 50 kJ/mole
3rd ionization energy 2405 kJ/mole Specific heat 0.18 J/gK
heat atomization 178 kJ/mole atoms

Oxidation & Electrons

Shells 2,8,18,25,8,2 electron configuration [Xe] 4f7 6s2
minimum oxidation number 0 maximum oxidation number 3
min. common oxidation no. 0 max. common oxidation no. 3
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Appearance & Characteristics

structure bcc: body-centered cubic color silvery-white
uses alloys, color TV phosphor toxicity
hardness mohs characteristics hard


reaction with air vigorous, = Eu2O3 reaction with 6M HCl mild, = H2, EuCl3
reaction with 6M HCl mild, = H2, EuCl3 reaction with 15M HNO3 mild, = Eu(NO3)3
reaction with 6M NaOH
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Other Forms

number of isotopes 2 hydride(s) EuH2
oxide(s) Eu2O3 chloride(s) EuCl2 EuCl3


ionic radius (2- ion) pm ionic radius (1- ion) pm
atomic radius 208 pm ionic radius (1+ ion) pm
ionic radius (2+ ion) 131 pm ionic radius (3+ ion) 108.7 pm
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thermal conductivity 13.9 J/m-sec-deg electrical conductivity 11 1/mohm-cm
polarizability 27.7 A^3


source Monazite(phosphate),bastnaesite rel. abund. solar system -1.012 log
abundance earth's crust 0.1 log cost, pure 3600 $/100g
cost, bulk $/100g
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World Wide Web presentation of Chemicool Periodic Table is © Copyright 1996-99 by David D. Hsu. Some data were provided by and used with the permission of JCE Software and is owned and copyright by the Division of Chemical Education, Inc. Additional data were provided by Perkin-Elmer through Peter Lykos of IIT. The information may not be redistributed without the permission of David Hsu or JCE Software.