67Solid
Ho 164.93 Atomic mass · uLanthanides
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.
Discovery 1878 (Marc Delafontaine)
K2L8M18N29O8P2
Physical properties
Values for the element in its standard state.
- Density
- 8.795g/cm³
- Melting point
- 1,747K
- Boiling point
- 2,973K
- Atomic radius
- Not available
- Bonding type
- Metallic
- Molar heat
- 27.15J/(mol·K)
Inside the atom
Electron arrangement and the energy behind its behavior.
Full electron configuration
1s, 2 electrons; 2s, 2 electrons; 2p, 6 electrons; 3s, 2 electrons; 3p, 6 electrons; 3d, 10 electrons; 4s, 2 electrons; 4p, 6 electrons; 4d, 10 electrons; 5s, 2 electrons; 5p, 6 electrons; 4f, 11 electrons; 6s, 2 electrons;
[Xe] represents 54 core electrons. The full view shows them explicitly.
67 electrons Orbital order preserved from source
- Electronegativity
- 1.23Pauling scale
- First ionization energy
- 581kJ/mol
- Electron affinity
- 50kJ/mol
- Van der Waals radius
- Not available
Ho HolmiumAtomic number 67
581kJ/mol
Atomic numberGaps indicate unavailable data
About holmium
- Appearance
- Silvery white
- Discovery
- 1878 (Marc Delafontaine)
- Data source
- Read the reference
A missing value means it is unavailable in this reference dataset. Values can vary with measurement method and conditions.