67 Ho 164.93
Holmium
Lanthanide
Holmium (Ho) is a chemical element with atomic number 67, classified as a lanthanide. At room temperature it is a solid. It was discovered in 1878 by Marc Delafontaine, Jacques-Louis Soret.
Properties
- Atomic number
- 67
- Atomic mass
- 164.93 u
- Category
- Lanthanide
- Group
- 0
- Period
- 6
- Block
- f-block
- Electron configuration
- [Xe] 4f¹¹ 6s²
- Phase at STP
- Solid
- Density
- 8.795 g/cm³
- Melting point
- 1734 K (1460.8 °C)
- Boiling point
- 2993 K (2719.8 °C)
- Electronegativity
- 1.23
- Atomic radius
- 226 pm
- Ionization energy
- 6.022 eV
- Discovery
- 1878 · Marc Delafontaine, Jacques-Louis Soret
Common uses
Lasers, nuclear reactors, magnets, medical procedures
Did you know?
Has the highest magnetic strength of any element.
Experiment with the elements
Holmium doesn't form any compounds in our lab yet, but the periodic table sandbox lets you combine dozens of other real elements into real compounds — water, table salt, ammonia and many more — with their true chemical formulas.