| Answer | Crossword Clue |
|---|---|
| NEON | Rare element. |
| YTTRIUM | Rare element. |
| EARTH | Rare .. (metallic element) |
| SCANDIUM | Rare earth element |
| CERIUM | Rare-earth element |
| YTTRIUM | Rare-earth element. |
| ERBIUM | Rare-earth element. |
| CERIUM | Element of rare-earth group. |
| RHODIUM | Rare element in platinum ores |
| PALLADIUM | Rare element harder than platinum. |
| EARTH | Rare ... (element of the lanthanide series) |
| YTTERBIC | Pertaining to a rare metallic element. |
| SCANDIUM | Rare-earth element named after where it was discovered |
