• Latin name:
  Holmium
• English name:
  Holmium
• Year discovered:
  1878
• Discovered by:
  Per Teodor Cleve, Auguste Honoré Charlois
• Country of Discovery:
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• Cost per 100 grams:
  790 USD
• CAS Number:
  CAS7440-60-0
• Electron shell:
  K2-L8-M18-N29-O8-P2-Q0-R0

Holmium is a chemical element with symbol Ho and atomic number 67. Part of the lanthanide series, holmium is a rare earth element. Holmium was discovered by Swedish chemist Per Theodor Cleve.

• Atomic number:
  67
• Atomic weight (Relative atomic mass):
  164.930329134847 (g/mol)
• Density:
  8.79 (g/cm³)
• Melting point:
  1461.0°C = 2661.80°F = 1734.15K
• Boiling point:
  2600.0°C = 4712.00°F = 2873.15K
• Valence electrons:
  3
• Period:
  6
• Group:
  
• Block:
  f - block
• Emission spectrum:
  

• Phase:
  Solid

  
• Fusion heat:
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• Specific heat:
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• Thermal expansion:
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• Vaporization heat:
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• Electron configuration:
  [Xe] 4f11 6s2 = 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f11 5s2 5p6 6s2
Oxidation states:

• -
• -
• -
• -
• -
• -
• -
• +2
• +3
• -
• -
• -
• -
• -
• -
• Ion charge:
  Ho³⁺
• The ionization potential of an atom:
  6.022 (eV)
• Atomic radius:
  226 (pm)
• Covalent radius:
  179 (pm)
• Van der Waals radius:
  216 (pm)

• Electrical conductivity:
  1228501.22850123 (S/m)
• Electrical type:
  Conductor
• Magnetic type:
  Paramagnetism
• Volume magnetic susceptibility:
  0.0482845
• Mass magnetic susceptibility:
  5.49 ⋅ 10^-6
• Molar magnetic susceptibility:
  9.05467 ⋅ 10^-7 (m³/mol)
• Resistivity:
  8.14 ⋅ 10^-7 (Ω · m)
• Superconducting point:
  ----

• Debye temperature:
  ----

• Colour:
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• CAS Number:
  CAS7440-60-0
• CID Number:
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• RTEC Number:
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• Brinell hardness:
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• Mohs hardness:
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• Vickers hardness:
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• Bulk modulus:
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• Young's modulus:
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• Liquid density:
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• Molar volume:
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• Poisson's ratio:
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• Shear modulus:
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• Speed of sound transmission:
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• Refractive index:
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• Thermal conductivity:
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• Electronegativity:
  1.23
• Valence electrons:
  3
• Electron affinity:
  32.61 kJ/mole

• Radioactive:
  No
• Half life:
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• Lifetime:
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• Neutron cross section, barn:
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• Universe contains "Holmium" at the rate of
  ----
• Sun contains "Holmium" at the rate of
  ----
• Oceans contain "Holmium" at the rate of
  2.2 ⋅ 10^-9%
• Human body contains "Holmium" at the rate of
  ----
• The Earth's crust consists of "Holmium" at the rate of
  1.3 ⋅ 10^-4%
• Meteorites consist of "Holmium" at the rate of
  5.9 ⋅ 10^-6%