Periodic Table of Elements

Element Holmium - Ho

Comprehensive data on the chemical element Holmium is provided on this page; including scores of properties, element names in many languages, most known nuclides of Holmium. Common chemical compounds are also provided for many elements. In addition technical terms are linked to their definitions and the menu contains links to related articles that are a great aid in one's studies.

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Overview of Holmium

Holmium's Name in Other Languages

  • Latin: Holmium
  • Czech: Holmium
  • Croatian: Holmij
  • French: Holmium
  • German: Holmium - s
  • Italian: Olmio
  • Norwegian: Holmium
  • Portuguese: Hólmio
  • Russian: Гольмий
  • Spanish: Hólmio
  • Swedish: Holmium

Atomic Structure of Holmium

Chemical Properties of Holmium

Physical Properties of Holmium

  • Atomic Mass Average: 164.9303
  • Boiling Point: 2968K 2695°C 4883°F
  • Coefficient of lineal thermal expansion/K-1: 9.5E-6
  • Conductivity
    Electrical: 0.0124 106/cm Ω
    Thermal: 0.162 W/cmK
  • Density: 8.8g/cc @ 300K
  • Description:
    Silver colored rare earth metal, which is slowly attacked by oxygen and water.
  • Elastic Modulus:
    • Bulk: 40.2/GPa
    • Rigidity: 26.3/GPa
    • Youngs: 64.8/GPa
  • Enthalpy of Atomization: 301 kJ/mole @ 25°C
  • Enthalpy of Fusion: 11.76 kJ/mole
  • Enthalpy of Vaporization: 241 kJ/mole
  • Flammablity Class:
  • Freezing Point: see melting point
  • Hardness Scale
    • Brinell: 746 MN m-2
    • Vickers: 481 MN m-2
  • Heat of Vaporization: 241kJ/mol
  • Melting Point: 1743K 1470°C 2678°F
  • Molar Volume: 18.74 cm3/mole
  • Physical State (at 20°C & 1atm): Solid
  • Specific Heat: 0.16J/gK

Regulatory / Health

  • CAS Number
    • 7440-60-0
  • OSHA Permissible Exposure Limit (PEL)
    • No limits set by OSHA
  • OSHA PEL Vacated 1989
    • No limits set by OSHA
  • NIOSH Recommended Exposure Limit (REL)
    • No limits set by NIOSH
  • Levels In Humans:
    Note: this data represents naturally occuring levels of elements in the typical human, it DOES NOT represent recommended daily allowances.
    • Blood/mg dm-3: n/a
    • Bone/p.p.m: n/a
    • Liver/p.p.m: n/a
    • Muscle/p.p.m: n/a
    • Daily Dietary Intake: n/a
    • Total Mass In Avg. 70kg human: n/a
  • Discovery Year: 1878
  • Name Origin:
    From Holmia Greek name for Sweden.
  • Abundance of Holmium:
    • Earth's Crust/p.p.m.: 1.4
    • Seawater/p.p.m.:
      • Atlantic Suface: 2.4E-07
      • Atlantic Deep: 2.9E-07
      • Pacific Surface: 1.6E-07
      • Pacific Deep: 1.6E-07
    • Atmosphere/p.p.m.: N/A
    • Sun (Relative to H=1E12): N/A
  • Sources of Holmium:
    Chief ores are monazite and bastnasite. Annual world production is around 10 tons. Primary mining areas are USA, Brazil, India, Sri Lanka, Australia and China.
  • Uses of Holmium:
    As control-rods for nuclear reactors because it readily absorbs neutrons. Also used as a flux concentrator for high magnetic fields.
  • Additional Notes:

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