| ISOTOPES | Soot pies turn out to be atoms in all chemical elements (8) |
| COMPOUND | Chemical substance formed from atoms of two or more chemical elements held together by chemical bonds (8) |
| HYDROGEN | Occurring with oxygen in water, the lightest of all the chemical elements, atomic number one (8) |
| ANGSTROM | Formerly used length of distance between atoms in molecules (8) |
| PERIODIC | ____ table, chart showing chemical elements arranged according to their atomic number (8) |
| HALFLIFE | The time taken for fifty per cent of the atoms in a radioactive material to undergo decay |
| AMMONITE | Fossil ___ see unusual atom in me (8) |
| NOBLEGAS | Any of the six chemical elements which make up Group 18 of the periodic table (5,3) |
| ATMOSPHERE | Atoms in motion acquiring pressure in this place? (10) |
| TRICYCLIC | Of a chemical compound, having three interconnected rings of atoms in its molecular structure (9) |
| STERIC | Relating to the arrangement of atoms in space |
| STAR | Any one of the celestial bodies in which atomic nuclei bind to form many of the chemical elements in the process of nucleosynthesis (4) |
| TRACEELEMENTS | Chemical elements, such as iron and zinc, needed in living organisms (5,8) |
| PERIODICTABLE | Chart showing the chemical elements in order of atomic number (8,5) |
| BENZENERING | In chemistry, what is a hexagonal configuration featuring six carbon atoms, each forming a single bond with a hydrogen atom in an alternating sequence of single and double bonds? (7,4) |
| TEN | Number of hydrogen atoms in a butane molecule |
| MONOCYCLIC | Having one ring of atoms in the molecule |
| CHESS | Game for which there are more possible iterations than atoms in the universe |
| NUCLEAR | ___ power, electricity generated by the splitting of uranium atoms in a reactor (7) |
| CRYSTAL | An array of atoms in the form of a mineral such as quartz (7) |
