| Answer | Crossword Clue |
|---|---|
| ION | Particle physicist's particle |
| LEPTON | Physicist's particle |
| ION | Physicist's particle |
| ATOMS | Particle physicist's particles |
| AXION | Physicist's proposed particle |
| ORBITAL | Particle physicist's s, p, d, or f |
| FERMIGROUND | Electrical safeguard in a particle physicist's lab? |
