| GASGIANT | Large planet consisting mainly of hydrogen and helium (3,5) |
| BONEHEAD | Idiot's wrong about atomic number of hydrogen and helium |
| WYKEHAM | William of -; bishop who directed the reconstruction of the upper ward of Windsor Castle in 31 Any one of the 300 billion luminous bodies of hydrogen and helium in the Milky Way whose birth takes plac |
| GILLAROO | Type of trout having a diet consisting mainly of aquatic snails (8) |
| CHILICON | Stew consisting mainly of beef, beans, chillies and spices (5,3,5) |
| COLESLAW | Type of salad consisting mainly of raw shredded cabbage (8) |
| ELEMENTS | Hydrogen and helium, e.g. (8) |
| STAR | Any one of the 300 billion luminous bodies of hydrogen and helium in the Milky Way whose birth takes place inside a nebula (4) |
| WATERGAS | Fuel consisting of hydrogen and carbon monoxide |
| NITROGEN | Ammonia is a compound of hydrogen and this colourless, odourless gas (8) |
| ANDROGEN | Hormone with equal parts of hydrogen and nitrogen |
| COHERING | Cobalt and helium joined by circuit should be sticking together (8) |
| ICEGIANTS | Bodies composed mainly of elements heavier than hydrogen and helium |
| BRONZE | Any of several alloys consisting mainly of copper and tin (6) |
| LEPIDOPTERA | Order of insects consisting mainly of butterflies and moths (11) |
| GUADELOUPE | Overseas department of France consisting mainly of the islands Basse-Terre and Grand-Terre |
| GREISEN | Light-coloured metamorphic rock consisting mainly of quartz and white mica (7) |
| CARNE | Stew consisting mainly of beef, beans, chillies and spices (5,3,5) |
| FAHRENHEIT | Physicist's in after explosion, storing hydrogen and helium separately |
| TRESELEMENTS | Oxygen, hydrogen and helium, to a Spanish language learner? |
