Holmium

Atomic number

67

Atomic mass (u)

164.93033

Category

Lanthanide

Standard state

Solid

Melting point

1473.85 °C (1747 K)

Boiling point

2699.85 °C (2973 K)

Density (g/cm³)

8.80

Electronegativity (Pauling)

1.23

Electron configuration

[Xe]6s2 4f11

Oxidation states

+3

Atomic radius (pm)

216

First ionization energy (eV)

6.022

Discovery & recognition

Discovery year / period (PubChem)

1878

Discovery credited to (RSC)

Per Teodor Cleve at Uppsala, Sweden and independently by Marc Delafontaine and Louis Soret in Geneva, Switzerland

Date or period recorded by RSC

1878

Discovery place

Geneva, Switzerland; independently Uppsala, Sweden

An ancient date does not identify a first human discovery. Different references may date observation, isolation and formal recognition differently.

Natural occurrence & production

The creation of an element’s nuclei and its concentration into terrestrial deposits are different processes. The occurrence note below concerns its presence or production on Earth; it is not a complete account of nucleosynthesis.

“Holmium is found as a minor component of the minerals monazite and bastnaesite.”

Royal Society of Chemistry · occurrence excerpt ↗

Continue the research

Reference values are not product specifications. Blank values have not been estimated. For superheavy elements, some properties and family assignments are theoretical or incompletely measured.