| Answer | Crossword Clue |
|---|---|
| MESON | Unstable nuclear particle |
| PION | Unstable nuclear particle |
| MESON | Unstable particle |
| MUON | Unstable particle |
| TAUON | Unstable particle |
| KAON | Unstable particle |
| MUON | Unstable subatomic particle |
| MESON | Unstable physics particle |
| KAON | Unstable subatomic particle |
| PSI | ... particle (unstable meson) |
| MUON | Type of unstable particle |
| TENDOWN | Its clue reads "Unstable subatomic particle" |
