| 1 | A | B | C | D | E |
| --- | --- | --- | --- | --- | --- |
| 2 | High-temperature superconductivity - Bi-, Tl- and Hg-based high-Tc superconductors |  |  |  |  |
| 3 | Formula | Notation | Tc (K) | No. of Cu-O planes in unit cell | Crystal structure |
| 4 | YBa2Cu3O7 | 123 | 92 | 2 | Orthorhombic |
| 5 | Bi2Sr2CuO6 | Bi-2201 | 20 | 1 | Tetragonal |
| 6 | Bi2Sr2CaCu2O8 | Bi-2212 | 85 | 2 | Tetragonal |
| 7 | Bi2Sr2Ca2Cu3O10 | Bi-2223 | 110 | 3 | Tetragonal |
| 8 | Tl2Ba2CuO6 | Tl-2201 | 80 | 1 | Tetragonal |
| 9 | Tl2Ba2CaCu2O8 | Tl-2212 | 108 | 2 | Tetragonal |
| 10 | Tl2Ba2Ca2Cu3O10 | Tl-2223 | 125 | 3 | Tetragonal |
| 11 | TlBa2Ca3Cu4O11 | Tl-1234 | 122 | 4 | Tetragonal |
| 12 | HgBa2CuO4 | Hg-1201 | 94 | 1 | Tetragonal |
| 13 | HgBa2CaCu2O6 | Hg-1212 | 128 | 2 | Tetragonal |
| 14 | HgBa2Ca2Cu3O8 | Hg-1223 | 134 | 3 | Tetragonal |

Question: What are the transition temperatures of the superconductors Bi-2201, Bi-2212 and Bi-2223?
Answer: The Bi-2201, Bi-2212 and Bi-2223 superconductors have transition temperatures of 20, 85 and 110 K.