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


Name Lutetium Symbol Lu
atomic number 71 Atomic weight 174.96
Density @ 293 K 9.85 g/cm3 Atomic volume 17.78 cm3/mol
Group Rare Earth, Lanthanides discovered 1907


state (s, l, g) s
melting point 1929.2 K boiling point 3600 K
Heat of fusion 18.60 kJ/mol Heat of vaporization 355.90 kJ/mol
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1st ionization energy 523.6 kJ/mole electronegativity 1.27
2nd ionization energy 1340 kJ/mole electron affinity 50 kJ/mole
3rd ionization energy 2022 kJ/mole Specific heat 0.15 J/gK
heat atomization kJ/mole atoms

Oxidation & Electrons

Shells 2,8,18,32,9,2 electron configuration [Xe] 4f14 5d1 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 hcp: hexagonal close pkd color silvery-white
uses alloys toxicity
hardness mohs characteristics


reaction with air vigorous, = Lu2O3 reaction with 6M HCl mild, = H2, LuCl3
reaction with 6M HCl mild, = H2, LuCl3 reaction with 15M HNO3 mild, = Lu(NO3)3
reaction with 6M NaOH
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Other Forms

number of isotopes 2 hydride(s) LuH2 LuH3
oxide(s) Lu2O3 chloride(s) LuCl3


ionic radius (2- ion) pm ionic radius (1- ion) pm
atomic radius 174 pm ionic radius (1+ ion) pm
ionic radius (2+ ion) pm ionic radius (3+ ion) 100.1 pm
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thermal conductivity 16.4 J/m-sec-deg electrical conductivity 16.7 1/mohm-cm
polarizability 21.9 A^3


source Monazite(phosphate),bastnaesite rel. abund. solar system -1.435 log
abundance earth's crust -0.3 log cost, pure 6900 $/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.