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2. Goes directly from solid state to gaseous state (8)
3. Negatively-charged electrode (7)
5. Complex ion shape with six ligands (10)
8. Imperial unit of pressure (abbrev) (3)
9. Flame test colour of lithium (7)
10. Egg (4)
13. 22nd letter of the Greek alphabet (3)
14. Jelly used to grow bacterial cultures (4)
16. Compounds with the same structural formula but a different arrangement in space (12)
17. Element with the shortest name (3)
20. German chemist and designer of the conical flask, whom it is sometimes named after (10)
21. Time required for 50% of the original population of radioactive atoms to decay (4,4)
22. SI unit of frequency (5)

1. Compounds with the general formula R-COOH (10,5)
4. Bauxite, for instance (3)
6. Allotrope of carbon (7)
7. Vitamin B3 (6)
9. Compounds composed of carbon and a metal (8)
10. Physicist portrayed by Cillian Murphy in the eponymous film of 2023 (11)
11. Organic group R-C=O or H-C=O (4)
12. ______ acid, C3H6O3 (6)
15. Catalyst in the Haber process (4)
18. Halogen discovered in seaweed (6)
19. Noble gas (4)