| 100% | ISOMER | 6 | Compound with the same number of atoms in a different arrangement |
| 68% | ISOMER | 6 | Compound with the same atoms in a different arrangement |
| 56% | ISOTONE | 7 | Either of two species of atoms with the same number of neutrons and a different number of protons |
| 50% | ISOTOPES | 8 | Atoms with the same number of protons |
| 46% | ISOTONE | 7 | One of a group of atoms having the same number of neutrons but a different number of protons |
| 44% | ISOTOPE | 7 | One of two or more atoms with the same atomic number that contain different numbers of neutrons |
| 44% | ISOMER | 6 | Compound of same molecule weight, different atom arrangement |
| 40% | ISOMEROUS | 9 | Having the same number of parts, in biology |
| 40% | LATTICE | 7 | Arrangement of atoms in a crystal structure |
| 40% | AREA | 4 | "___ 51," 2015 sci-fi horror film with the number of a famous, highly classified Air Force facility in its title |
| 39% | STERIC | 6 | Of the spatial relationship of atoms in a molecule |
| 39% | FOUR | 4 | Only number with the same number of letters as its value |
| 39% | TWELVE | 6 | The number of pennies in a pre-decimal shilling |
| 38% | ISOTONES | 8 | Atoms that have the same number of neutrons |
| 38% | ISOMER | 6 | Similar compound with different atom arrangement |
| 38% | ERROR | 5 | Writing the same number twice in a sudoku row, e.g. |
| 37% | ELON | 4 | University in a town of the same name |
| 37% | TWO | 3 | Number of words beginning with the letter "f" in this puzzle |
| 37% | TWO | 3 | Number of words in this puzzle beginning with the letter "C" |
| 37% | COEQUALLY | 9 | In a way that's like people of the same rank |
| 36% | VERSATILE | 9 | Able to be used in a number of different ways |
| 36% | ODD | 3 | Like the number of games in a "best of" series |
| 36% | MSPACMAN | 8 | Female protagonist in a video game of the same name |
| 36% | ARGO | 4 | Fictional movie in a real movie of the same name |
| 36% | SAILING | 7 | Moving in a boat with the aid of the wind |
| 36% | BROOKLYNNETS | 12 | Basketball team from the same city as 30a and ranked as the sixth most valuable NBA team in 2018 with a valuation of $2.3 billion: 2 wds. |
| 36% | MEDIAN | 6 | The middle number in a sequence of numbers |
| 36% | TWENTYSIX | 9 | The number of complete miles in a marathon |
| 36% | ONE | 3 | Number in the definition of a Mersenne prime |
| 36% | MEDIAN | 6 | The middle number in a sorted list of numbers |