Tabla

Electronic ConfigurationXe 6s2 4f13

Melting Point1545°C

Boiling Point1947°C

Density9.321g cm⁻³

Description

Soft grey metallic element that belongs to the lanthanoids. One natural isotope exists, ¹⁶⁹Tm, and seventeen artificial isotopes have been produced. No known uses for the element. Discovered in 1879 by Per Theodor Cleve.

Covalent Radius164pm

Double131pm

Ionisation Energies

Oxidation States0, +2, +3

Uses

Radioactive Thulium is used to power portable x-ray machines, eliminating the need for electrical equipment.

Electron Affinity99.283kJ mol⁻¹

Electronegativity1.25PAULING

Atomic Volume18.1cm³ mol⁻¹

Atomic Radius177pm

Van Der Waals Radius227pm

Sources

Found with other rare earths in the minerals gadolinite, euxenite, xenotime, and monazite. Monazite is often 50% rare earth by weight and 0.007% Thulium.

Discovery

Discovered in 1879 by Per Theodor Cleve in Sweden

Name Origin

From Thule ancient name of Scandinavia.

CAS7440-30-4

Crust Abundance0.52mg kg⁻¹

Sea Abundance1.70x10⁻⁷mg dm⁻³

Enthalpy of Vapourisation 232kJ mol⁻¹

Enthalpy of Formation232.2kJ mol⁻¹

Specific Heat - 20°C0.16J (g ⋅ K)⁻¹

Isotope	Abundance	Half Life
169Tm	100%	-
171Tm	-	-

https://reuben.science

https://github.com/reubn/tabla

Using data from mendeleev.

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