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.