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

SymbolHo
Atomic number67
Group0
Period6
Blockf
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

Atomära egenskaper

Electronegativity (Pauling Scale)1.23
Electron affinity32.61 kJ/mol
Ionization energies
1581 kJ/mol
2 1140 kJ/mol
3 2204 kJ/mol
4 4100 kJ/mol

Electron configuration

Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f11 5s2 5p6 6s2
Electrons per shell2, 8, 18, 29, 8, 2

History

Discovered1878
Discovered byJacques-Louis Soret
Marc Delafontaine