Tabla

Electronic ConfigurationXe 6s2 4f11

Melting Point1474°C

Boiling Point2695°C

Density8.795g cm⁻³

Description

Relatively soft and malleable silvery-white metallic element, which is stable in dry air at room temperature. It oxidizes in moist air and at high temperatures. It belongs to the lanthanoids. A rare-earth metal, it is found in the minerals monazite and gadolinite. It possesses unusual magnetic properties. One natural isotope, ¹⁶⁵Ho exists, six radioisotopes exist, the most stable being ¹⁶³Ho with a half-life of 4570 years. Holmium is used in some metal alloys, it is also said to stimulate the metabolism. Discovered by Per Theodor Cleve and J.L. Soret in Switzerland in 1879. The name homium comes from the Greek word Holmia which means Sweden. While all Holmium compounds should be considered highly toxic, initial evidence seems to indicate that they do not pose much danger. The metal's dust however, is a fire hazard.

Covalent Radius166pm

Double133pm

Ionisation Energies

Oxidation States0, +3

Uses

It has very few practical applications; however, it has some unusual magnetic properties that offer some hope for future applications.

Electronegativity1.23PAULING

Atomic Volume18.7cm³ mol⁻¹

Atomic Radius179pm

Van Der Waals Radius230pm

Sources

Occurs in gadolinite. Most often from monazite which is often 50% rare earth and typically 0.05% Holmium.

Discovery

Discovered in 1878 by J.L. Soret in Switzerland

Name Origin

From Holmia, the Latinized name for Stockholm, Sweden.

CAS7440-60-0

Crust Abundance1.3mg kg⁻¹

Sea Abundance2.20x10⁻⁷mg dm⁻³

Enthalpy of Vapourisation 301kJ mol⁻¹

Enthalpy of Formation300.6kJ mol⁻¹

Specific Heat - 20°C0.164J (g ⋅ K)⁻¹

Isotope	Abundance	Half Life
165Ho	100%	-

https://reuben.science

https://github.com/reubn/tabla

Using data from mendeleev.

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