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


Name Holmium Symbol Ho
atomic number 67 Atomic weight 164.9304
Density @ 293 K 8.80 g/cm3 Atomic volume 18.7 cm3/mol
Group Rare Earth, Lanthanides discovered 1879


state (s, l, g) s
melting point 1743.2 K boiling point 2873 K
Heat of fusion 12.20 kJ/mol Heat of vaporization 241.0 kJ/mol
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1st ionization energy 580.7 kJ/mole electronegativity 1.23
2nd ionization energy 1139 kJ/mole electron affinity 50 kJ/mole
3rd ionization energy 2204 kJ/mole Specific heat 0.16 J/gK
heat atomization 301 kJ/mole atoms

Oxidation & Electrons

Shells 2,8,18,29,8,2 electron configuration [Xe] 4f11 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, =>Ho2O3 reaction with 6M HCl mild, =>H2, HoCl3
reaction with 6M HCl mild, =>H2, HoCl3 reaction with 15M HNO3 mild, =>Ho(NO3)3
reaction with 6M NaOH
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Other Forms

number of isotopes 1 hydride(s) HoH2 HoH3
oxide(s) Ho2O3 chloride(s) HoCl3


ionic radius (2- ion) pm ionic radius (1- ion) pm
atomic radius 176 pm ionic radius (1+ ion) pm
ionic radius (2+ ion) pm ionic radius (3+ ion) 104.1 pm
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thermal conductivity 16.2 J/m-sec-deg electrical conductivity 11.4 1/mohm-cm
polarizability 23.6 A^3


source Monazite(phosphate),bastnaesite rel. abund. solar system -1.051 log
abundance earth's crust 0.1 log cost, pure 740 $/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.