Thallium
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| Name: | Thallium |
| Symbol: | Tl |
| Atomic Number: | 81 |
Thallium is an element, number 81 on the periodic table. (TNG: "Who Watches The Watchers")
| Name: | Thallium |
| Symbol: | Tl |
| Atomic Number: | 81 |
Thallium is an element, number 81 on the periodic table. (TNG: "Who Watches The Watchers")
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