Concept information
PREFERRED TERM
Thorium
TYPE
-
Entity
DEFINITION
- [Wikipedia] Thorium is a weakly radioactive metallic chemical element with the symbol Th and atomic number 90. Thorium is silvery and tarnishes black when it is exposed to air, forming thorium dioxide; it is moderately soft, malleable, and has a high melting point. Thorium is an electropositive actinide whose chemistry is dominated by the +4 oxidation state; it is quite reactive and can ignite in air when finely divided.
BROADER CONCEPT
ENTRY TERMS
- Th
URI
https://w3id.org/ozcar-theia/c_ec54c81f
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