Symbol Ho
Atomic Number 67
Atomic Mass 164.930
Discovered by Holmium was discovered by Per Teodor Cleve at Uppsala, Sweden and independently by Marc Delafontaine and Louis Soret in Switzerland.

Chemical Properties of Holmium

Group Lanthanides Melting point 1472°C, 2682°F, 1745 K
Period 6 Boiling point 2700°C, 4892°F, 2973 K
Block f Density (g cm−3) 8.80
Atomic number 67 Relative atomic mass 164.930    
State at 20°C Solid Key isotopes 165Ho
Electron configuration [Xe] 4f11 6s2 CAS number 7440-60-0
ChemSpider ID 22424 ChemSpider is a free chemical structure database

What is Holmium?

  • Holmium is the 67th element in the periodic table. It is soft and malleable with the symbol being Ho. This element belongs to the series of lanthanides in the periodic table. It has excellent stability at room temperature and is soluble in acids. The metal is highly affected by water and oxygen.
  • Holmium possesses good magnetic permeability and is a good absorber of neutrons. For this purpose, it has many applications in the field of magnetics. It was discovered by a chemist named J.L. Soret in the year 1878. It is a highly reactive metal when burnt in the presence of air.
  • Holmium is a paramagnetic as well as a ferromagnetic metal at a temperature below 19k. It appears as a bright and silver metal, and when it is oxidized, it forms an oxide which is yellowish in color. It has about one natural isotope and out of its synthetic isotopes,  one is holmium-163 and it has a half-life of about 4570 years.

Uses of Holmium

  • The alloys of holmium are used to create high magnetic fields in a magnetic flux concentrator.
  • It is used as the control rods in nuclear reactors because of its high neutron capture cross-section.
  • The oxides of this metal are used as a coloring agent in the glass.
  • It is employed in optical spectrophotometers for the purpose of calibration.
  • It also has a wide number of applications in the field of medical, fiber-optics, and in dental areas.

Practise This Question

Calculate the change of entropy ΔrSm at 298 K for the reaction in which urea is formed from NH3 and CO2. The standard entropy of NH2CONH2 is 174.0 JK1mol1. For NH3, CO2 and H2O it is 192.3, 213 and 69.9JK1