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Holmium (Ho)

From Wikipedia, the free encyclopediaHolmium 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.

Holmium in the periodic table

Atomic number67
Element categoryLanthanide

Physical properties

Phase at STPSolid
Density8.79 g/cm3
Atomic weight164.93 u
Melting point1734 K
1460.85 °C
2661.53 °F
Boiling point2873 K
2599.85 °C
4711.73 °F

Atomic properties

Electronegativity (Pauling Scale)1.23
Electron affinity32.61 kJ/mol
Oxidation states0, +1, +2, +3
(a basic oxide)
Ionization energies
1581 kJ/mol
2 1140 kJ/mol
3 2204 kJ/mol
4 4100 kJ/mol

Electron configuration

Elektronkonfiguration (shorthand)[Xe] 4f11 6s2
Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f11 5s2 5p6 6s2
Electrons per shell2, 8, 18, 29, 8, 2


Discovered byJacques-Louis Soret
Marc Delafontaine
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