| Clue | Source | Date |
|---|---|---|
| Pair in a helium atom | ||
| Positive particles | New York Times | 11 Jan 2022 |
| Particles composed of two up quarks and one down quark | New York Times | 06 Jun 2021 |
| Octet in an oxygen atom | Universal | 08 Jun 2020 |
| Positively charged particles | ||
| Positively charged particles | ||
| Atom parts | ||
| Carbon sextet | ||
| Positively charged subatomic particles | ||
| Positively charged particles | ||
| Helium pair | ||
| Nucleus occupants | ||
| Atom parts | ||
| Components of atoms | ||
| Atomic particles | ||
| Atomic nuclei | ||
| Parts of atoms. | ||
| Atomic nuclei. | ||
| Charged nuclear particles. |