| 423 / | HD | CHEMISTRY OF INORGANIC COMPOUNDS |
| 249 | DF | RADIOACTIVE (AT. NO. 84+ OR RADIOACTIVE ISOTOPE OF ANOTHER ELEMENT) {3} |
| 253 | DF | .~ Uranium compound {1} |
| 254 | | .~.~ Binary compound {5} |
| 255 | DF | .~.~.~> Hydrogen containing |
| 256 | DF | .~.~.~> Carbon containing |
| 257 | DF | .~.~.~> Chlorine containing |
| 258 | DF | .~.~.~> Fluorine containing {1} |
| 260 | DF | .~.~.~> Oxygen containing {1} |