| CHLORINE | Chemical element, the second lightest of the halogens (8) |
| HELIUM | Noble gas whose chemical symbol is He. Used in welding and rocket fuel, it is the second, lightest known element. |
| IODINE | Least active of the halogens |
| BROMINE | One of the halogens |
| HYDROGEN | The lightest of the chemical elements, atomic number 1 (8) |
| ASTATINE | Radioactive chemical element of the halogen series occurring as a decay product of uranium and thorium; atomic no. 85 (8) |
| FLUORINE | Toxic pale yellow gas of the halogen series that is the most reactive non-metallic element (8) |
| FLOURINE | Toxic as of the halogen group with the atomic number 9 (8) |
| ELEMENTS | Halogens, lanthanides, noble gases, alkali metals ... general name for the 118 chemical substances arranged on the periodic table (8) |
| AT | A highly unstable radioactive element (the heaviest of the halogen series) |
| LAMBDAPARTICLE | Greek character has piece that is the lightest of the hyperons (6.8) |
| IODIN | Nonmetallic element belonging to the halogens (5) |
| LITHIUM | Lightest of the known metallic elements; from Greek, ' stone' (7) |
| BERYLLIUM | Lightest of the alkaline earth metals (9) |
| BR | A nonmetallic largely pentavalent heavy volatile corrosive dark brown liquid element belonging to the halogens. |
| MAIN | Word for the chief element; the most part; strength; the high sea; or, a principal pipe or cable (4) |
| ELFOWLS | Sparrow-sized birds in the Strigiformes order, the lightest of all its species (3,4) |
| HERBARIUM | A woman's element, the dried plant collection |
| SILICON | Element the Italian incorporated in fake coins (7) |
| ISOTOPE | Element the same, only different one old poet's misrepresented |
