| Symbol |
Th |
|
| Atomic Number |
90 |
Relative Atomic Mass
12C = 12.0000 |
232.0381 |
Atomic Radius
pm |
180 |
First Ionisation Energy
kJ mol-1 |
587 |
| Electronegativity |
1.3 |
Density
kg m-3 |
11720 [293 K] |
Molar Volume
cm3 |
19.80 |
Thermal Conductivity
W m-1 K-1 |
54.0 [300 K] |
Melting Point
K |
2023 |
Boiling Point
K |
c. 5060 |
| Number of Isotopes |
25 |
Ground State Electron
Configuration |
[Rn]6d27s2 |
| Term Symbol |
3F2 |
| Discovery |
Discovered by J.J. Berzelius (Stockholm, Sweden) in 1829 |
| Name Derived From |
Named after Thor (Norsk god of war) |
Name in Other
Languages |
 Croatian | Torij |
 Danish | thorium |
 Dutch | thorium |
 Finnish | torium |
 French | thorium |
 German | Thorium |
 Italian | torio |
 Norwegian | thorium |
 Portuguese | tório |
 Spanish | torio |
 Swedish | torium |
| Peter van der Krogt's Element Multidict - element name translations in over 48 langauges |
