Complete Clue List
Across
1. Tentatively RID BAR, allowing crop to sprout (Scot., anag., 6)
4. Rigid airship; would have benefitted from using 22D as a lifting gas, rather than hydrogen (8)
10. Domestic or farming employee; unsure whether this applies to a laboratory assistant (5,4)
11. More than enough (5)
12. Group 18 gas (#18), 3rd-most abundant in Earth's atmosphere, from Greek for "lazy" or "inactive" (5)
13. Very unstable synthetic Group 18 element (#118), named after Russian-American nuclear physicist (9)
14. Capable of being possessed (7)
16. Colourless Group 18 gas (#10), named after Greek word "new", reddish-orange glow in lamps (4)
19. Gas escape (4)
21. TORSION unwinds for -N=O functional group (anag., 7)
24. Very observant (5-4)
25. Plant tissue, part of the circulatory system (5)
26. Unreactive; another name for Group 18 elements: ____ gases (5)
27. REAGENT WE rewrote for a young person between about eight and 12 years old (anag., 9)
28. Thin tissue layer (8)
29. Displaying a feeling of dread or anxiety (6)
Down
1. Nuclear model named for a Danish physicist (4,4)
2. Somehow AGREES ON this sometime name for the Group 18 elements (anag., 8)
3. Radioactive Group 18 gas (#86), occurs naturally as a decay product of thorium and uranium (5)
5. Clarify (7)
6. Exhausted; like a mine whose resources are spent (6,3)
7. Cunning ESPIAL of digestive enzyme (anag., 6)
8. "You ____ worry" (contraction, 6)
9. A member of a family of organic compounds that includes acetone (6)
15. Tower of London guard, apparently not a vegetarian (9)
17. Informal name for a member of the Group 18 family of elements (sing., 5,3)
18. Once; the symbol for 12A was ____ "A" (until 1957) but now is "Ar" (8)
20. Group 18 gaseous element (#36), used in lighting and photography, name means "the hidden one" (7)
21. Elbowed (6)
22. Colourless Group 18 gas (#2), named after the sun, where first detected; product of alpha decay (6)
23. Shining brightly, like lamps produced using Group 18 elements (6)
25. Unlike other Group 18 gases, #54 undergoes some reactions; named after Greek for "stranger" (5)