67
Ho
Holmium
164.930332
28182982
#67
Holmium
lanthanide· Solid·164.930332 u
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.
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Identity
- Symbol
- Ho
- Atomic Number
- 67
- Atomic Mass
- 164.930332 u
- Category
- lanthanide
- Block
- f-block
- Period
- 6
- Group
- 3
- Appearance
- silvery white
- Year Discovered
- 1878 CE
- Discovered By
- Marc Delafontaine
- Named By
- Stockholm
Electrons
- Configuration
- [Xe] 4f11 6s2
- Full Configuration
- 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f11
- Shells
- 2, 8, 18, 29, 8, 2
- Electronegativity
- 1.23
- Electron Affinity
- 32.61
- Oxidation States
- +3
- Ionization Energies
- 581, 1140, 2204, 4100
Physical Properties
- State at
- Solid
- Melting Point
- 1734
- Boiling Point
- 2873
- Density
- 8.79
- Molar Heat
- 27.15 J/(mol·K)
- Crystal Structure
- HEX
- Magnetic Ordering
- Paramagnetic
Mechanical
- Covalent Radius
- 192 pm
- Metallic Radius
- 176 pm
- Mohs Hardness
- 2
- Bulk Modulus
- 40 GPa GPa
- Shear Modulus
- 26.3 GPa GPa
- Young's Modulus
- 64.8 GPa GPa
Thermal & Electrical
- Thermal Conductivity
- 16.2 W/(m K) W/(m·K)
- Electrical Conductivity
- 1.23 MS/m S/m
- Specific Heat
- 165 J/(kg K) J/(g·K)
- Heat of Vaporization
- 265 kJ/mol kJ/mol
- Heat of Fusion
- 17 kJ/mol kJ/mol
Abundance
- Universe
- 500 ppt
- Sun
- 0.5 ppb
- Meteorite
- 54.0 ppb
- Earth's Crust
- 1.3 ppm
- Ocean
- 2.2e-7 ppm
- Human Body
- 0