Thorium

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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.

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