In detail

Holmium (Ho) - Properties


Atomic mass, symbol and atomic number

holmium is a natural element with the element symbol Ho and atomic number 67. In the periodic table it belongs to the lanthanides with an atomic mass of 164.93 u. The chemical element discovered by Per Teodor Cleve in 1879 is not radioactive and is in a solid state at room temperature.

Profile: Holmium (English Holmium)

General
Chemical element:holmium
Symbol:Ho
Atomic number:67
Group:lanthanides
Period:6
Block:f-block
Series:lanthanides
Appearance:silver
explorers:Per Teodor Cleve
Year of discovery:1879
Atomic properties
Atomic mass:164.93 u
Atomic radius:175 pm
Covalent radius:192 pm
Van der Waals radius:???
Electron configuration:Xe 4f11 6s2
ionization:581.0 kJ / mol
Physical Properties
Physical state:firmly
Density:???
Crystal structure:hexagonal
Magnetism:paramagnetic
molar volume:18,74 · 10-6 m3/ mol
Mohs hardness:???
Melting point:1461 ° C
Boiling point:2600 ° C
Heat of fusion:17 kJ / mol
Heat of vaporization:251 kJ / mol
Thermal conductivity:16 W
Chemical properties
electronegativity:1,23

Did you know that ...

  • Holmium immediately oxidized on contact with air?
  • the element was named after the Swedish capital Stockholm (Latin Holmia)?
  • Holmium is used in medical technology because of its magnetic properties?
  • Holmium belongs to the metals of the rare earths?