| # | Clue | Answer As Given | Value | Round | Category | Air Date | Show |
|---|---|---|---|---|---|---|---|
| For actinium, it's 89 | atomic number | $400 | DJ | 2-WORD SCIENCE TERMS | 2023-01-20 | #8790 | |
| In alpha decay a radioactive atom emits 2 protons, making it a new element as this figure drops by 2 | atomic number | $1,600 | DJ | PHYSICAL SCIENCE | 2011-12-21 | #6273 | |
| It can be abbreviated "at. no." | atomic number DD | $1,000 | DJ | SCIENCE | 1988-05-24 | #872 |