| Rating | Solver | Clue |
|---|---|---|
| LEAD | Chemical element Pb | |
| SILICON | Chemical element | |
| NEON | Chemical element | |
| NITROGEN | Chemical element | |
| CARBON | Chemical element | |
| OXYGEN | Chemical element | |
| ARSENIC | Chemical element | |
| BROMINE | A halogen chemical element | |
| ISOTOPE | Variation of a chemical element | |
| ATOM | The smallest particle of a chemical element | |