It's Elementary: Group 4 Crossword Puzzle

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November is a month when people emphasise writing: novels, quizzes, verse, questions and even crosswords. "It's Elementary" is my November 2022 crosswording theme. Included here in Group 4 of the Periodic Table is an element named after a prominent New Zealand scientist. There are two anagrams. Enjoy!
Author: psnz - Diff: Harder [ Scores ]

ACROSS

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    • Complete Clue List

      Across
      1. Souvenir item (1-5)
      4. Descriptive of water that's somewhat salty (8)
      9. Corrosion resistance means process equipment like ____ (not the war weapons) are made from 1D (5)
      10. Secure from lepidoptera (9)
      11. Common sense, or so say we in France (4)
      12. Without; 1D is quite ductile (wire forming), especially in an oxygen-____ environment (4)
      13. Mourner in the Biblical Book of Ruth (Ruth 1:2-5 [NIV]) (5)
      15. Of little value, like 5D because of its short half-life (13 hours) and radioactive nature (7)
      16. Grand achievement, like an historic chemist identifying an unknown Group 4 element (4)
      17. Zr and Hf: ____ elements among the most difficult to separate due to chemical similarity (3)
      20. Eins, zwei, ____ (4)
      21. Type in again, as a password (2-5)
      24. Charged forms of metals, at greatest risk for toxicity, such as Hf compounds (5)
      25. Surrounded by (4)
      26. In 1808, chemist Sir Humphry ____ attempted to isolate 28A by electrolysis and named the element (4)
      28. A lustrous, strong metallic element resembling 1D; atomic number 40 (9)
      29. Alloys of 1D are strong and lightweight; uses include jet engines and ____craft (5)
      30. Type of writer, maybe even a scientist discussing discoveries (8)
      31. Oxidation numbers, also known as oxidation ____; with Group 4 these are mainly +4 and also +3 (6)

      Down

      1. Group 4 element named after a group in Greek myth (8)
      2. One recognised for outstanding contributions: see 5D (UK spelling, 8)
      3. Corrosion resistance of 1D means it's used instead of iron which tends to ____ (4)
      5. Synthetic, radioactive Group 4 element, named after 1908 Nobel Chemistry Laureate (13)
      6. Danish physicist Niels Bohr was born here in 1885 (10)
      7. Attachable patch or transfer for (1A)s (4-2)
      8. Latin name for 6D, after which element #72 is named (6)
      10. SADISTIC CRY I'M making about saturated fats from nutmeg (anag., 8,5)
      14. FRY REACTOR? Not with these stable Group 4 metals, very resistant to heat and wear (adj., anag., 10)
      18. "I've got proof!" Like 1D's melting point being 1,668 C/3,034 F (2'1,1,4)
      19. Dreary colour of 28A (UK spelling, 8)
      22. Fail miserably (6)
      23. Prelims (abbr., 6)
      27. Ain't right? (contraction, 3'1)