| 100% | HALOGEN | 7 | Any element in group 17 of the periodic table |
| 61% | GROUP | 5 | Any set of elements in a column on the periodic table |
| 60% | GAS | 3 | Any element in the rightmost column of the periodic table |
| 59% | ALKALI | 6 | Any element in the first column of the periodic table, except hydrogen |
| 51% | NONMETAL | 8 | Any of about 18 elements on the periodic table |
| 48% | BORON | 5 | What B stands for, in the periodic table of elements |
| 47% | NEON | 4 | One of the inert gases in the periodic table of elements |
| 46% | METALS | 6 | Elements on the left side of the periodic table |
| 46% | METALS | 6 | About 80% of the elements in the period table |
| 43% | HYDROGEN | 8 | The first element in the periodic table |
| 43% | XENON | 5 | Element above radon in the periodic table |
| 43% | TIN | 3 | Element above lead in the periodic table |
| 43% | HYDROGEN | 8 | Element number 1 in the Periodic Table |
| 43% | HYDROGEN | 8 | The lightest element in periodic table, symbol H |
| 42% | ZIRCONIUM | 9 | Alphabetically last element in the periodic table |
| 42% | ZIRCONIUM | 9 | Last element alphabetically in the periodic table |
| 42% | METALS | 6 | Most of the periodic table |
| 42% | TRACEELEMENT | 12 | Depict part of the periodic table? |
| 42% | DMITRI | 6 | ___ Mendeleev, creator of the periodic table |
| 41% | DIR | 3 | Any of the four words hidden in 17-, 26-, 43- and 56-Across: Abbr. |
| 41% | IRON | 4 | Element that is represented in the periodic table as "Fe" |
| 41% | INERT | 5 | Like gases in the rightmost column of the periodic table |
| 41% | GASES | 5 | Rightmost column of the periodic table, e.g. |
| 40% | CAPITAL | 7 | Any of the cities found in 17- and 56-Across and 11- and 24-Down |
| 40% | ELEMENTS | 8 | The Periodic Table is full of them |
| 39% | MENDELEEV | 9 | He proposed the periodic table in 1869 |
| 39% | NEON | 4 | Element to the right of fluorine on the periodic table |
| 38% | NEON | 4 | One of the inert gases on the periodic table of elements |
| 38% | CANTO | 5 | Any of 17 in Byron's "Don Juan" (the last unfinished) |
| 38% | SPINDLE | 7 | Element in the tale of Sleeping Beauty |