| Answer | Crossword Clue |
|---|---|
| ISOTOPE | Useful form of a chemical element. |
| ISOTOPE | Form of a chemical element. |
| IODO | Combining form for chemical element. |
| ARSENO | Poisonous chemical element: Comb. form |
| OXYGENATE | Treat with a chemical element. |
| IODIC | Containing a certain chemical element. |
| OSMIC | Containing a bluish metallic chemical element |
| NIOBE | Mythological Theban with a chemical element named after her |
