Chemicool

Ho

67

164.9304
Holmium
General | States | Energies | Oxidation & Electrons |Appearance & Characteristics
Reactions | Other Forms |Radius | Conductivity | Abundance
Encyclopedia Britannica articles

General

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

States

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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Energies

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

Reactions

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

Radius

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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Conductivity

thermal conductivity 16.2 J/m-sec-deg electrical conductivity 11.4 1/mohm-cm
polarizability 23.6 A^3

Abundance

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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