| Answer | Crossword Clue |
|---|---|
| ATNOS | Atomic numbers: Abbr. |
| isotones | one of two or more atoms having an equal number of neutrons but different atomic numbers |
| isotone | one of two or more atoms having an equal number of neutrons but different atomic numbers |
| AMU | Atomic ....: abbr. |
| MOLS | Atomic groups: Abbr. |
| ATNO | Atomic number: Abbr. |
