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61-80
periodic table
| Term | Definition |
|---|---|
| Promethium | Pm |
| Samarium | Sm |
| Europium | Eu |
| Gadolinium | Gd |
| Terbium | Tb |
| Dysprosium | Dy |
| Holmium | Ho |
| Erbium | Er |
| Thulium | Tm |
| Ytterbium | Yb |
| Lutetium | Lu |
| Hafnium | Hf |
| Tantalum | Ta |
| Tungsten | W |
| Rhenium | Re |
| Osmium | Os |
| Iridium | Ir |
| Platinum | Pt |
| Mercury | Hg |
| Gold | Au |
| Thallium | To |
| Lead | Pb |
| Bismuth | Bi |
| Polonium | Po |
| Astatine | At |
| Radon | Rn |
| Francium | Fr |
| Radium | Ra |
| Actinium | Ac |
| Thorium | Th |