| 423 / | HD | CHEMISTRY OF INORGANIC COMPOUNDS |
| 1 | DF | TREATING MIXTURE TO OBTAIN METAL CONTAINING COMPOUND {15} |
| 2 | DF | .~ Radioactive metal (At. No. 84+ or radioactive isotope of another metal) {1} |
| 3 | DF | .~.~ Actinide series metal (At. No. 89+) {7} |
| 5 | | .~.~.~ Fusing |