| Answer | Crossword Clue |
|---|---|
| ISOTOPES | Forms of elements having same atomic number. |
| ISOTOPE | One of several elements, having the same atomic number. |
| ISOTOPES | Elements having the same atomic number. |
| isotope | one of two or more forms of a chemical element having the same atomic number but different atomic weights |
| isotopes | one of two or more forms of a chemical element having the same atomic number but different atomic weights |
| superheavy | Relating to or denoting an element with an atomic mass or atomic number greater than those of the naturally occurring elements, esp. one belonging to a group above atomic number 110 having proton/neutron ratios that in theory confer relatively long half-lives |
