| ___ smasher | 11 |
| Very small matter | 17 |
| Tiny power unit | 15 |
| Tiny bundle of energy | 21 |
| Supercollider collider | 22 |
| Subject of fission | 18 |
| Subject for John Dalton | 23 |
| Smashable thing | 15 |
| Small wonder? | 13 |
| Quantum theory subject | 22 |
| Powerful mite | 13 |
| Power particle | 14 |
| Pion's place | 16 |
| Physicist's concern | 23 |
| Particle for Bohr | 17 |
| One source of energy | 20 |
| One of three in a water molecule | 32 |
| Nucleus + electrons | 19 |
| Nuclear fission target | 22 |
| Nature's building block | 27 |
| N.R.C. concern | 14 |
| Molecule constituent | 20 |
| Molecule building block | 23 |
| Molecular building block | 24 |
| Mighty bit | 10 |
| Little matter | 13 |
| Lepton's locale | 19 |
| Label on the first of two file drawers, often | 45 |
| Item of interest to Niels Bohr | 30 |
| It's tiny and it may get smashed | 36 |
| It's split in a lab | 23 |
| It's smashed in a lab | 25 |
| It's little matter | 22 |
| It's elementary | 19 |
| It's been split | 19 |
| It's a small thing | 22 |
| It might be split | 17 |
| It may be smashed | 17 |
| It has one or more shells | 25 |
| Interest of Fermi | 17 |
| Hard thing to split | 19 |
| Focus for Fermi | 15 |
| Fissionable item | 16 |
| Fermi's tidbit | 18 |
| Fermi's study | 17 |
| Fermi's particle | 20 |
| Fermi's fascination | 23 |
| Electron's place | 20 |
| Electron home | 13 |
| Diminutive DC superhero | 23 |
| Democritus' indivisible unit | 32 |
| Cyclotron input | 15 |
| Chemistry 101 study | 19 |
| Bohr's subject | 18 |
| Bohr's bit | 14 |
| Bohr's bailiwick | 20 |
| Bohr subject | 12 |
| Bit of science | 14 |
| Basic biological building block | 31 |
| A bit of chemistry? | 19 |
| "Life: A User's Manual" author Georges | 52 |
| Word that comes from the Greek for "indivisible" | 58 |
| Where electrons orbit | 21 |
| Where a quark is located | 24 |
| What the Bohr model depicts | 27 |
| What Massive Attack will be "Splitting"? | 50 |
| What Massive Attack will be "Splitting" | 49 |
| Wee bit of physics | 18 |
| Volume 1 of a two-volume encyclopedia? | 38 |
| Uranium unit | 12 |
| Unit quantified in a subscript | 30 |
| Unit proposed by Leucippus | 26 |
| Unit of a molecule | 18 |
| Unit in a Brownian model | 24 |
| Tiny energy source | 18 |
| Tiny bit to split | 17 |
| Tiny bit of matter | 18 |
| This might split at the best show of your life | 46 |
| Thing that might decay | 22 |
| “The Sweet Hereafter” director Egoyan | 45 |
| The H, H or O in H2O | 20 |
| The ___, comics crime fighter | 29 |
| Teeny-tiny bit | 14 |
| Teeny particle | 14 |
| Teeny component | 15 |
| Symbol of the post-1945 age | 27 |
| Supercollider projectile | 24 |
| Subject of Bohr's theory | 28 |
| Subject of Bohr's research | 30 |
| Subject for Fermi | 17 |
| Splitting it releases energy | 28 |
| Source of power | 15 |
| Sometimes it's smashed | 26 |
| Sometimes it gets smashed | 25 |
| Something to smash | 18 |
| Something smashable | 19 |
| Smidgen that's smashed | 26 |
| Smashing target | 15 |
| Smasher or bomb | 15 |
| Smashed item | 12 |