| # | Clue | Answer As Given | Value | Round | Category | Air Date | Show |
|---|---|---|---|---|---|---|---|
| "Earth" used to refer to certain oxides; hence this term for samarium & friends | rare earth | $1,200 | DJ | CHEMISTRY | 2021-12-13 | #8531 | |
| Used to make lenses, lutetium is one of these "uncommmon" metals | rare earth | $1,600 | DJ | BRAVING THE ELEMENTS | 2019-04-17 | #7973 | |
| Though it's much more common in the Earth's crust than lead, say, cerium is known as this type of "earth" element | rare earth | $1,600 | DJ | WE'VE GOT CHEMISTRY | 2016-12-01 | #7414 |