Chemistry Now days

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Across
  1. 2. A substance with a pH greater than 7 (4)
  2. 7. Subatomic particle (8)
  3. 9. Type of chemical bond formed by sharing electrons (9)
  4. 10. Chemical species with an electric charge (3)
  5. 12. Center of an atom (7)
  6. 13. Type of substance formed by combining two or more elements (8)
  7. 16. Particle with a positive charge in the nucleus (6)
  8. 17. Smallest unit of a chemical element (4)
  9. 18. Negatively charged particle (8)
Down
  1. 1. Ending result of a chemical reaction (7)
  2. 3. Substance that is dissolved in a solvent (6)
  3. 4. A substance that speeds up a chemical reaction (8)
  4. 5. Column in the periodic table (7)
  5. 6. Substance in which the solute dissolves (7)
  6. 8. Element with different numbers of neutrons (7)
  7. 11. A substance with a pH less than 7 (4)
  8. 12. Number of protons in an atom (7)
  9. 14. Particle with no charge in the nucleus (7)
  10. 15. Substance that participates in a chemical reaction (8)
  11. 17. Basic unit of matter (4)