Chemicool

Eu

63

151.96
Europium
General | States | Energies | Oxidation & Electrons |Appearance & Characteristics
Reactions | Other Forms |Radius | Conductivity | Abundance
Encyclopedia Britannica articles

General

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

States

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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Energies

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

Reactions

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

Radius

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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Conductivity

thermal conductivity 13.9 J/m-sec-deg electrical conductivity 11 1/mohm-cm
polarizability 27.7 A^3

Abundance

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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