Periodic Table of the Elements: Thulium
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| Atomic Number: | 69 |
| Atomic Symbol: | Tm |
| Thuliumthulium [from Thule, an ancient name for Scandinavia], metallic chemical element; symbol Tm; at. no. 69; at. wt. 168.93421; m.p. about 1,545°C;; b.p. 1,947°C;; sp. gr. 9.3; valence +3. Thulium is a soft, malleable, ductile, lustrous silver-white metal. ..... Click the link for more information. | |
| Atomic Weight: | 168.93421 |
| Electron Configuration: | 2 · 8 · 18 31 · 8 · 2 |