Periodic Table of the Elements: Thorium
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| Atomic Number: | 90 |
| Atomic Symbol: | Th |
| Thoriumthorium [from Thor], radioactive chemical element; symbol Th; at. no. 90; mass number of most stable isotope 232; m.p. about 1,750°C;; b.p. about 4,790°C;; sp. gr. 11.7 at 20°C;; valence +4. Thorium is a soft, ductile, lustrous, silver-white, radioactive metal. ..... Click the link for more information. | |
| Atomic Weight: | 232.03806 |
| Electron Configuration: | 2 · 8 · 18 32 · 18 10 · 2 |