| TOM | Split the atoms and disturb a cat |
| MOAT | Split the atom and protect the castle (4) |
| ACORN | British computer manufacturing company (1978-1999) noted for models including the Atom and the BBC Micro (5) |
| NOMINATE | Name the nine to split the atom (8) |
| YOYO | Toy for a "Split the Atom" trick |
| ERNEST | The first man to split the atom, ... Rutherford |
| RUTHERFORD | Nuclear physicist who was the first man to split the atom, Sir Ernest ... |
| ERNESTWALTON | 20th-Century Irish physicist who, along with John Cockcroft, was the first to split the atom (6,6) |
| ATRANDOM | Cape Town dollar split the atom haphazardly (2,6) |
| LEAVEITTOPSMITH | I've split the atom! - smashed to make this novel form |
| HALFLIFE | The time taken for fifty per cent of the atoms in a radioactive material to undergo decay |
| ELECTRONS | Found in the nuclei of all atoms and discovered by J. J. Thomson, the lightest stable subatomic particles known (9) |
| NIELSBOHR | 1922 Nobel physics laureate, for work on “the structure of atoms and [...] the radiation emanating from them” |
| TAUTOMER | Either of two or more isomers of a chemical compound existing together in equilibrium and interconvertible by migration of atoms and bonds (8) |
| ART | It "should comfort the disturbed and disturb the comfortable," according to a saying |
| NIECES | I make a scene and disturb the women (6) |
| TALFLSFE | Time taken for half the atoms of a radioactive sample to decay (8) |
| LATTICE | Regular geometric arrangement of points or objects such as the atoms in a crystal (7) |
| STAMPOUT | Eradicate the atoms put in random order (5,3) |
| CHEMISTS | Scientists investigating properties of matter including atoms and molecules (8) |
