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Holmium

67
Ho
164.9304
Holmium
 General | States | Energies | Oxidation & Electrons | Appearance & Characteristics | Reactions | Other Forms Radius | Conductivity | Abundance

General:

Name: Holmium Symbol: Ho
Group: Rare Earth, Lanthanides 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

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

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:

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

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