Thorium

From Citizendium, the Citizens' Compendium
Jump to: navigation, search
This article is a stub and thus not approved.
Main Article
Talk
Related Articles  [?]
Bibliography  [?]
External Links  [?]
Citable Version  [?]
Properties [?]
 
This editable Main Article is under development and not meant to be cited; by editing it you can help to improve it towards a future approved, citable version. These unapproved articles are subject to a disclaimer.
Thorium
232.0381(1)



  Th
90
1s22s22p63s23p63d104s24p6 4d105s25p64f145d106s26p66d27s2
[ ? ] Actinide:
Properties:
Soft, silvery-white, ductile metal.
Hazard:
Radioactive. Powdered thorium is pyrophoric.


Thorium is a chemical element, having the chemical symbol Th. Its atomic number (the number of protons) is 90. It has a standard atomic weight of 232.0381 g•mol −1 and it is a solid in its elemental form.

Thorium is considered a member of the "Actinide" class of elements. At a pressure of 101.325 kPa, it has a boiling point of 4,788 °C and a melting point of 1,750 °C.