| NUCLEON | General name for a neutron or a proton (7) |
| PARTICLE | Word for something as seemingly simple as a crumb or a speck of dust but also for a highly complex structure, such as an atom, proton, neutron or quark (8) |
| CADMIUM | Toxic metallic element used as a neutron absorber in the control of nuclear fission (7) |
| NEUTRON | An uncharged particle with about the same mass as a proton (7) |
| PERSONA | The character portrayed by a Proton? (7) |
| DEUTERON | Nucleus comprising a proton and a neutron |
| BETADECAY | Process that may transform a neutron into a proton |
| UPQUARK | One of two in a proton |
| NOTAPRO | A proton, perhaps, takes no charges? (3,1,3) |
| ISOTOPE | Variant of a chemical element wth a different neutron number (7) |
| GLUON | A type of boson, suitably named for it is the "adhesive" that binds a quark to form a proton or neutron (5) |
| POINTER | Neutron Dancers of 1985? (7,7) |
| SISTERS | Neutron Dancers of 1985? (7,7) |
| PULSARS | Rotating neutron stars, or white dwarfs (7) |
| NOCHARGE | Punch line to a joke that starts with a neutron walking into a bar |
| MUDDY | Setter's covering three quarks in a neutron a€“ confused? (5) |
| ISOTONE | One of two nuclides with the same neutron number but different proton numbers |
| DENSEST | Like neutron stars, vis-a-vis everything else |
| ANECDOTAL | Unreliable engineer located a neutron (9) |
| TRITIUM | Radioactive isotope of hydrogen produced in nuclear reactors by neutron activation of lithium-6; from Greek, 'third' (7) |
