| Answer | Crossword Clue |
|---|---|
| MUONS | Unstable subatomic particles |
| PIONS | Unstable subatomic particles |
| MUON | Unstable subatomic particle |
| KAON | Unstable subatomic particle |
| TENDOWN | Its clue reads "Unstable subatomic particle" |
| KAONS | Unstable particles |
| HYPERONS | Unstable particles |
| MUONS | Unstable particles |
| HYPERONS | Unstable particles with great mass |
