Related Clues:
- Film director Egoyan
- With 28-Across, particle accelerators
- Elemental building block
- Mighty bit
- Where electrons orbit
- Electron's locale
- Building block of matter
- Bit that may be split
- Molecule maker
- Fissionable unit
- Something smashable
- Inconsequential amount
- It's next to nothing
- Basic unit
- Director Egoyan