| 100% | ISOTONE | 7 | Either of two species of atoms with the same number of neutrons and a different number of protons |
| 62% | ISOTONE | 7 | One of a group of atoms having the same number of neutrons but a different number of protons |
| 54% | ISOTOPE | 7 | One of two or more atoms with the same atomic number that contain different numbers of neutrons |
| 52% | ISOMER | 6 | Compound with the same number of atoms in a different arrangement |
| 46% | ISOTOPES | 8 | Atoms with the same number of protons |
| 39% | ISOTONES | 8 | Atoms that have the same number of neutrons |
| 38% | COUPLET | 7 | Two lines of poetry with the same rhythm and rhyme |
| 37% | ISOTOPES | 8 | Same number of protons, different neutrons |
| 35% | MASS | 4 | Total number of protons and neutrons in an atom |
| 35% | ISOMER | 6 | Compound with the same atoms in a different arrangement |
| 35% | ION | 3 | Atom with unequal number of protons and electrons |
| 33% | NUCLEUS | 7 | The part of the atom containing protons and neutrons |
| 32% | FOUR | 4 | Only number with the same number of letters as its value |
| 31% | BOHRIUM | 7 | Element with atomic number 107 which was named after a Danish physicist who studied the structure of atoms |
| 31% | LELY | 4 | Peter —, 17th-century painter whose works include Girl with a Parrot and Two Ladies of the Lake Family |
| 31% | TIE | 3 | Result when two teams score the same number of points |
| 31% | DIE | 3 | Cube with a different number of pips on each side |
| 30% | SALEM | 5 | Capital of the only state with a two-sided flag using different designs on each side |
| 30% | CHAR | 4 | Actor who played a character with the same first name on "Two and a Half Men" |
| 30% | TAUTONYM | 8 | Classification with the same genus and species names |
| 30% | JIMMYJOHNSON | 12 | Football coach who won a National Championship with the University of Miami and two Super Bowls with the Dallas Cowboys (2 wds.) |
| 30% | REIN | 4 | Either of two long narrow straps attached to each end of the bit of a bridle |
| 29% | NOGALES | 7 | Arizona city across the border from a city of Sonora with the same name |
| 29% | GLENDAJACKSON | 13 | English actress (1936-2023) who achieved the American Triple Crown of acting with two Oscars, three Emmys, and a Tony award (2 wds.) |
| 29% | COUPLET | 7 | *Poetic structure with two lines, often with the same meter and rhyme |
| 29% | CARPET | 6 | Python species with the same name as a floor cover |
| 29% | WINNIPEG | 8 | Provincial capital south of a lake with the same name |
| 29% | CALENDAR | 8 | Chart with the days, weeks, and months of a year |
| 29% | 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. |
| 29% | JACKNICKLAUS | 12 | He was nicknamed "The Golden Bear" of golf and holds a record for the highest number of wins in Masters Tournament with six titles: 2 wds. |