| Answer | Crossword Clue |
|---|---|
| ORG | NOW element |
| NITON | Element now called radon. |
| nebulium | a hypothesized element now discredited |
| nebuliums | NEBULIUM, a hypothesized element now discredited |
| virginium | a name proposed for chemical element no 87, now called francium |
| virginiums | VIRGINIUM, a name proposed for chemical element no 87, now called francium |
| columbium | a rare element of the vanadium group, now more commonly called niobium |
| columbiums | COLUMBIUM, a rare element of the vanadium group, now more commonly called niobium |
