| ALKALI | - metal; any one of the six elements constituting Group 1 of the periodic table including lithium, potassium and sodium (6) |
| HALOGEN | Any one of the six nonmetallic elements constituting group 17 of the periodic table (7) |
| RAREEARTH | One of a set of 17 chemical elements in the periodic table, including the lanthanides (4-5) |
| NOBLEGASES | Collective term for six elements, including helium, that are almost never chemically reactive (5,5) |
| SCANDAL | Two elements constituting dirt? |
| REACT | Kick back produced by six elements (5) |
| OSMIUM | Metal of the platinum group, one of the heaviest substances known (6) |
| SEARCHER | ... member of 60s group, one of the Seekers |
| ARGON | Element constituting 0.93 per cent of Earth's atmosphere |
| NOBLEGAS | Any of the six chemical elements which make up Group 18 of the periodic table (5,3) |
| HALOGENS | It refers to the elements of group 17 of the periodic table (8) |
| GROUP | Any one of the 18 elemental columns of the periodic table (5) |
| ZINC | The first chemical element in group 12 of the periodic table, last but one when listed alphabetically (4) |
| GAS | Any element in the rightmost column of the periodic table |
| RUTHENIUM | Rare metallic element in the platinum group of the periodic table (9) |
| MENDELEYEV | Creator of the periodic table of elements |
| GOLD | Element occupying group 11 of the periodic table with copper, silver and roentgenium (4) |
| NEON | Element that shares a group of the periodic table with argon, helium, krypton, radon and xenon (4) |
| PRIMOLEVI | Author of The Periodic Table, the Royal Institution's "best science book ever written" |
| INERTGAS | Item in Group 8A of the periodic table |
