Thorium - Element Properties and Periodic Table Information

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

Chemical Elements

Periodic Table

Definition of the Thorium Element
A radioactive metallic element that occurs combined in minerals and is usually associated with rare earths.

Origin / Meaning of the name Thorium
Thorium was named after Thor, the Norse God of War.

Classification of the Thorium Element
Thorium classified as an element in the Actinide 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 of the Lanthanide and Actinide series. Most of the elements in the Actinide series are synthetic or man-made.

Facts about the Discovery and History of the Thorium Element
Thorium was discovered by Jons Jacob Berzelius  in Sweden in 1828.

Occurrence the Thorium Element
Monazite is the primary source of thorium

Associated Uses of Thorium
Nuclear fuel
 

The Properties of the Thorium Element
Name of Element : Thorium
Symbol of Element : Th
Atomic Number of Thorium : 90
Atomic Mass: 232.0381 amu
Melting Point: 1750.0 °C - 2023.15 °K
Boiling Point: 4790.0 °C - 5063.15 °K
Number of Protons/Electrons in Thorium : 90
Number of Neutrons in Thorium : 142
Crystal Structure: Cubic
Density @ 293 K: 11.72 g/cm3
Color of Thorium : silvery

Thorium and the Periodic Table
Check out Thorium 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 Thorium 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.

Thorium - 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 Thorium is just one element that can be found.
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The Element Thorium

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