| Answer | Crossword Clue |
|---|---|
| IONS | Relatives of protons. |
| ATOM | It's made of electrons and protons |
| ATOM | Aggregate of protons, neutrons and electrons. |
| ISOTOPES | Atoms with the same number of protons |
| ATOMICCAGE | Holder of pet electrons, protons and neutrons? |
| ISOTONE | Either of two atoms with equal neutrons but not protons |
| ONE | Number of protons by which the elements in the four longest puzzle answers have been enhanced |
| ISOTONE | One of a group of atoms having the same number of neutrons but a different number of protons |
