Thulium - Element Properties and Periodic Table Information

Thulium - An element from the Periodic Table based on the IOUPAC 1985 standard

Chemical Elements

Periodic Table

Definition of the Thulium Element
A bright, silvery rare-earth element obtained commercially from monazite, having an x-ray emitting isotope that is used in small portable medical x-ray units.

Origin / Meaning of the name Thulium
Named after Thule, an ancient Roman name for a mythical country in the far north, possibly Scandinavia.

Classification of the Thulium Element
Thulium classified as an element in the Lanthanide series as one of the "Rare Earth Elements" which can located in Group 3 elements of the Periodic Table and in the 6th and 7th periods. The Rare Earth Elements are divided into the Lanthanide and Actinide series. The elements in the Lanthanide series closely resemble lanthanum, and one another, in their chemical and physical properties. Their compounds are used as catalysts in the production of petroleum and synthetic products.

Facts about the Discovery and History of the Thulium Element
Thulium was discovered by Per Teodor Cleve in Sweden in 1879

Occurrence the Thulium Element
Found in small quantities in minerals with other rare earths - gadolinite, euxenite, xenotime

Associated Uses of Thulium
Lasers
Power for portable x-ray machines
 

The Properties of the Thulium Element
Name of Element : Thulium
Symbol of Element : Tm
Atomic Number: 69
Atomic Mass: 168.9342 amu
Melting Point: 1545.0 °C - 1818.15 °K
Boiling Point: 1727.0 °C - 2000.15 °K
Number of Protons/Electrons: 69
Number of Neutrons: 100
Crystal Structure: Hexagonal
Density @ 293 K: 9.321 g/cm3
Color: silverish

Thulium and the Periodic Table
Check out Thulium on the Periodic Table which arranges each chemical element according to its atomic number, as based on the periodic law, so that chemical elements with similar properties are in the same column. Our Periodic Table is simple to use - just click on the symbol for Thulium for additional information and for an instant comparison of the Atomic Weight, Melting Point, Boiling Point and Mass - G/cc with any other element. An invaluable source of facts and information as a Chemistry reference guide.

Thulium - IUPAC and the Modern Standardised Periodic Table
The Standardised Periodic Table in use today was agreed by the International Union of Pure Applied Chemistry, IUPAC, in 1985 and now recognises more periods and elements than Dimitri  Mendeleev knew in his day but still all fitting into his concept of  the "Periodic Table" in which Thulium is just one element that can be found.
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The Element Thulium

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