| Answer | Crossword Clue |
|---|---|
| ACTINIDE | Periodic table's ... series |
| IRON | Periodic table's Fe |
| NEON | Periodic table's no. 10 |
| INERTGAS | Item in the periodic table's last column |
| lanthanide | Any of the series of fifteen metallic elements from lanthanum to lutetium in the periodic table |
| lanthanides | Any of the series of fifteen metallic elements from lanthanum to lutetium in the periodic table |
