| Answer | Crossword Clue |
|---|---|
| GAS | Hydrogen, for one |
| SYMBOL | H for hydrogen, for one |
| ELECTRON | Hydrogen has one |
| PROTON | Hydrogen has one |
| PROTON | A hydrogen atom has one |
| NUKE | Hydrogen bomb, for short |
| ATWT | 1, for hydrogen: Abbr. |
| ATWT | 1.008, for hydrogen (abbr.) |
| HNC | Chem. formula for hydrogen isocyanide |
| ATNO | 1 for hydrogen or 2 for helium: Abbr. |
