Related Clues:
- Minuscule bits
- Quantum mechanics subjects
- Molecular matter
- John Dalton theorized on them
- Benzene ring sextet
- Matter, essentially
- Chemical building blocks
- Chemistry 101 models
- Least little bits
- Tiny pieces as of dust
- Small pieces as of dust
- Tiny spots
- Small particles or spots
- Small dots or particles
- All very small because it's about a cat