Complete Clue List
Across
4. Layer? (3)
8. European body of water, higher salinity than a freshwater lake, but lower than open ocean (5,3)
9. How to divide things to be fair (6)
10. Person advocating strong armed capability, perhaps including chemical weapons (10)
11. Inert gas with lighting applications (4)
12. Japanese for "teacher" (6)
14. Self-centred (8)
15. Wrote on a blackboard (7)
17. Wood-marking tool (7)
21. Lighter, softer (8)
23. German chemist Justus von ____ (1803-73) founded agricultural chemistry; names a lab condenser (6)
25. Petri dish filler (4)
26. SIMMERS ORE, resulting in learning devices (anag., UK spelling, 10)
28. Derives by reasoning (6)
29. Characteristic of 7D, 18D, 20D and 1D (sing., 8 or 3-5)
30. Colour, something seen with Group 17 elements (3)
Down
1. Nonmetallic solid Group 17 element (#53), named after the Ancient Greek for 'violet-coloured' (6)
2. Decorative needle case (4)
3. Rarest naturally occurring element (#85), this Group 17 member's name means "unstable" (8)
4. Group 17 compounds (7)
5. Adjacent; Group 17 is ____ the Noble gases in the Periodic Table (4,2)
6. Synthetic Group 17 element (#117), named after a landlocked US State (10)
7. Extremely reactive, pale-yellow Group 17 gas (#9); compounds have an oral health role (8)
12. Little bit of time (abbr., 3)
13. Meaning of 16D in relation to the type of compounds produced by Group 17 elements (sing., 4,6)
16. Common name for the Group 17 elements; also see 13D (8)
18. Yellow-green gaseous Group 17 element (#17); very reactive; named from Greek word for its colour (8)
19. Equipment (3)
20. Group 17 element (#35), second (of two) liquid at STP, named from Ancient Greek for "stench" (7)
22. Tangle up (var., 6)
24. Bit of progress (with Group 17 research?) (6)
27. Whole lot; like the large number of 4D that exist (4)