67HoHolmium164.930332[Xe] 4f¹¹ 6s²
lanthanide
Holmium
Holmium is a chemical element with symbol Ho and atomic number 67. Part of the lanthanide series, holmium is a rare earth element. Holmium was discovered by Swedish chemist Per Theodor Cleve.
A stylized shell model. Electrons are quantum objects, not particles following these literal paths. Sizes and motion are illustrative.
Electrons by shell
Electron configuration
4f11
6s2
54 is the [Xe] core total across five shells.
At a glance
- Atomic number
- 67
- Atomic mass
- 164.930332 u
- Phase
- Solid
- Density
- 8.79 g/cm³
- Melting point
- 1,734 K
- Boiling point
- 2,873 K
- First ionization energy
- 581 kJ/mol
- Electronegativity
- 1.23
- Electron affinity
- 32.61 kJ/mol
- Molar heat capacity
- 27.15 J/(mol·K)
- Period
- 6
- Appearance
- silvery white
Conditions and isotopes affect measured properties. Some properties of short-lived elements are predicted. Electronegativity uses the Pauling scale.
Keep exploring
Explore the stories, imagery, and reference data in more depth. Properties with no value in the reference are marked unavailable.