| CLEF | Perhaps, symbol for chlorine electron and fluorine (4) |
| CL | Chemical symbol for chlorine |
| HALOGENS | Slogan he developed for chlorine and fluorine? (8) |
| NAIF | Primitive sodium, iodine and fluorine (4) |
| ATOM | Unit of matter containing one or more electrons and a compact nucleus of protons and neutrons (4) |
| GASEOUS | Like chlorine and fluorine |
| HALOGEN | Any of the chemical elements astatine, iodine, bromine, chlorine and fluorine (7) |
| THIEF | Criminal article about iodine and fluorine (5) |
| TOPAZ | Precious stone, a silicate of aluminium and fluorine (5) |
| HALIDES | Bromine and fluorine compounds |
| TARIFF | Salt and fluorine imports providing tax |
| HALO | No information on fluorine, perhaps something good and light |
| FAIR | Just fluorine and a mixture of gases (4) |
| NEON | It's between fluorine and sodium (4) |
| FILM | Shoot fluorine and iodine over 50 metres (4) |
| MESON | Subatomic particle intermediate in mass between an electron and a proton, typically composed of a quark and an antiquark (5) |
| FREERADICAL | An atom or group of atoms containing at least one unpaired electron and existing for a brief period of time before reacting to produce a stable molecule |
| DIPOLE | Thick solution essentially cold, with electron and couple of charges (6) |
| MESONS | Subatomic particle with a mass between an electron and a proton (6) |
| ION | It's lost an electron, and iron has lost a right (3) |
