Related Clues:
- It can be viewed with a scanning tunneling microscope
- Bit that can be split
- Molecule portion
- One of trillions in a single human body
- Physics class topic
- Thing that might decay
- Little bit of matter
- Nuclear-energy source
- Cyclotron fodder
- Fundamental matter?
- Shred half the letters
- Scene of bonding
- Alpha male in scrap
- Nucleus plus electrons
- Part of molecule