| Fermi's concern | 19 |
| Fermi interest | 14 |
| Excitable one | 13 |
| Energy source in a small package | 33 |
| Energy particle | 15 |
| Elemental combiner | 18 |
| Element particle | 16 |
| Electrons' place | 20 |
| Electron's locale | 21 |
| Electron's home | 19 |
| Echobelly song about physics? | 29 |
| Director Egoyan of the upcoming "Adoration" | 53 |
| Diminutive DC Comics superhero, with "The" | 52 |
| Diagram subject in a chemistry text | 35 |
| Democritus' unit | 20 |
| Democritus postulated it | 24 |
| Cyclotronic bit | 15 |
| Cyclotron fodder | 16 |
| Controversial power source | 26 |
| Concern of Niels Bohr | 21 |
| Concern of Compton and Fermi | 28 |
| Concern for Edward Teller | 25 |
| Chemistry class subject | 23 |
| Chemistry book chapter,with "the" | 43 |
| Chemistry bit | 13 |
| Certain smasher's target | 28 |
| Certain smasher input | 21 |
| Cartoon character ___ Ant | 25 |
| Building block of physics | 25 |
| Building block of molecules | 27 |
| Bohr model depiction | 20 |
| Bit with a nucleus | 18 |
| Bit to be split | 15 |
| Bit that may be split | 21 |
| Bit that can be split | 21 |
| Bit of beryllium | 16 |
| Basis of all, to Lucretius | 26 |
| Basic physics focus | 19 |
| Ant who once teamed with Secret Squirrel | 40 |
| Anagram for moat | 16 |
| An energy source | 16 |
| Alphabet's first half | 25 |
| Accelerator item | 16 |
| Accelerated bit | 15 |
| A.E.C.'s concern | 20 |
| A.E.C. concern | 14 |
| A bit that can be split | 23 |
| "We have split the ___" | 33 |
| "Up and ___!" (Radioactive Man's battle cry) | 58 |
| "Smallest unit of matter"Ani DiFranco sings about | 59 |
| "Ararat" director Egoyan | 34 |
| _____ smasher | 13 |
| _____ bomb | 10 |
| ____ smasher | 12 |
| ____ bomb | 9 |
| ___ Ant ('60s cartoon hero) | 31 |
| __ bomb | 7 |
| Wee | 3 |
| Tiny | 4 |
| Minute | 6 |
| Minuscule | 9 |
| Itty-bitty | 10 |
| Kind of energy | 14 |
| Kind of number | 14 |
| Infinitesimal | 13 |
| Energy type | 11 |
| Teeny-tiny | 10 |
| Kind of warfare | 15 |
| Extremely tiny | 14 |
| Part of A.E.C. | 14 |
| Nuclear | 7 |
| Kind of clock or number | 23 |
| ___ energy | 10 |
| Like some plants | 16 |
| Like some energy | 16 |
| Kind of clock or bomb | 21 |
| ___ clock | 9 |
| __ energy | 9 |
| Very, very tiny | 15 |
| Very tiny | 9 |
| Very minute | 11 |
| Type of power or clock | 22 |
| Type of clock or number | 23 |
| Part of AEC | 11 |
| Kind of pile | 12 |
| Kind of bomb or clock | 21 |
| Word with power or reactor | 26 |
| Word with particle or pile | 26 |
| Word with age or weight | 23 |
| Word with "energy" or "submarine" | 53 |
| Word with ''energy'' or ''bomb'' | 64 |
| Word before number or weight | 28 |
| Wing adjective | 14 |
| Type of clock or energy | 23 |
| Too small to see | 16 |
| Tinier than tiny | 16 |
| Superprecise, as some clocks | 28 |
| Super hot, as Buffalo wings | 27 |
| Sort of clock or power | 22 |
| Sort of clock or number | 23 |