| # | Clue | Answer As Given | Value | Round | Category | Air Date | Show |
|---|---|---|---|---|---|---|---|
| Harold Urey won a Nobel Prize for his discovery of this heavy form of hydrogen | deuterium | $800 | J | "D" NATURE OF THINGS | 2021-10-25 | #8496 | |
| About 1 hydrogen atom in 6,500 is this isotope | deuterium | $2,000 | DJ | "D" IN SCIENCE | 2006-07-24 | #5051 | |
| Hey, man!--that's heavy hydrogen | deuterium | $500 | J | "D" IN SCIENCE | 1997-10-01 | #3008 |