Complete Clue List
Across
1. Chemical with the molecular formula HNO2 (7,4)
7. Utmost degree? (init., 3)
9. Group 16 silver-white metalloid (#52), named by Klaproth (1798) after Latin word for 'earth' (9)
10. At a great height, where 21A is limited (3,2)
11. Weaken, after prolonged inactivity (8)
12. Bright yellow Group 16 nonmetal, known since ancient times as 'brimstone' (US spelling, 6)
14. Medicine bottle (4)
16. LOG CHANCES, revealing name for Group 16 elements that means "ore forming" (anag., 10)
18. Agreed, reluctantly (6,4)
19. Manipulative sort (4)
21. Gaseous Group 16 nonmetal (#8), Earth's most abundant element, replenished by photosynthesis (6)
22. Radioactive Group 16 metal (#84), extracted from pitchblende in 1898 by the Curies (8)
25. Baghdad resident (5)
26. Property exhibited by some Group 16 elements of existing in two or more physical forms (9)
28. Miss after marriage (3)
29. EARLINESS I'M finding petrifies or fossilises (anag., UK spelling, 11)
Down
1. Edible seed; a Brazil ____ is a rich source of 17D (3)
2. Eagle's claw (5)
3. Eyelike opening, in architecture (6)
4. Wag classes (4,6)
5. Deep sleep (4)
6. Optical device that spreads light evenly, softening it (var., 8)
7. Devices for removing contaminants (9)
8. Wanders or goes astray (7,4)
11. Synthetic Group 16 element (#116), named for the federal research laboratory in California (11)
13. Colourful neckwear associated with manual workers (4-6)
15. Narrow lanes or streets between buildings (9)
17. Group 16 nonmetal and essential nutrient (#34), used in xerographic photocopiers and printers (8)
20. Like a major artery (6)
23. Fetters, named for chemical element #26 (5)
24. Animal reflex which may increase the amount of 21A in the lungs (4)
27. "Absolutely!" (3)