The Heart of the Matter

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Across
  1. 5. A mixture like milk or fog where particles don't settle
  2. 7. It has a lot of "mettle" when it comes to conducting heat
  3. 8. A bond formed by the "stealing" of electrons
  4. 9. The "fourth state" of matter found in stars
  5. 11. To go directly from solid to gas
  6. 13. A "meddle" of two or more metals
  7. 14. Physically combined, but not chemically bonded
  8. 17. The smallest unit of a compound
  9. 20. A "stable" or "unstable" sibling in the element family
  10. 22. Something you should never trust, because they make up everything
  11. 23. An atom with a positive or negative "outlook"
  12. 24. Mass divided by volume
  13. 26. A substance that deserves a "salute" for disappearing into a liquid
  14. 28. The most "positive" part of the atom
  15. 30. A type of bond where atoms "share" electrons
Down
  1. 1. It marks the end of a sentence or a row on a table
  2. 2. The common result of an acid-base reaction
  3. 3. The outermost electrons, crucial for bonding
  4. 4. A substance that speeds up a reaction without being consumed
  5. 6. Type of chemistry that’s "all-natural" (and Carbon-based)
  6. 9. A long chain of repeating molecular units
  7. 10. The "negative" cloud dweller
  8. 12. Same formula, different structure
  9. 15. A vertical column, often sharing chemical "traits"
  10. 16. The most "brilliant" or "glowing" member of the Noble gas family
  11. 18. A measure of disorder within a system
  12. 19. A chemical "instigator" that refuses to get involved in the drama
  13. 20. A "pressing" element for a laundry day (Fe)
  14. 21. The "heart" of the matter
  15. 25. The substance that does the dissolving (like water)
  16. 27. Two or more elements chemically combined
  17. 29. James’s chemical connection?
  18. 31. A solution where water is the solvent