Chemistry

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Across
  1. 3. Maximum number of electrons in the K-shell.
  2. 4. A mixture of two or more elements, where at least one is a metal.
  3. 7. The property allowing metal to be drawn into wires.
  4. 10. The orbit or energy level of an electron.
  5. 12. The main metal ion causing water hardness.
  6. 16. Sub-atomic particle with a positive charge.
  7. 17. Scientist who proposed fixed electron energy levels.
  8. 19. The ion that precipitates out on boiling.
  9. 20. Washing ___ (Na2​CO3​) is used to soften water.
  10. 21. Number (A) is the sum of protons and neutrons.
  11. 24. Atoms of the same element with different neutron counts.
  12. 25. Element mixed with copper to make bronze.
  13. 26. Another key ion responsible for water hardness.
  14. 28. Relating to the number of protons (Z).
  15. 29. Used in water softeners to exchange ions.
  16. 30. Shiny surface property of metals.
Down
  1. 1. Electrons that are free to move throughout the metallic structure.
  2. 2. Central part of an atom where mass is concentrated.
  3. 5. The subatomic particle that orbits the nucleus.
  4. 6. The property of being hammered into sheets.
  5. 8. The white solid deposited from hard water (___scale).
  6. 9. The electrical state of a stable atom.
  7. 11. Main metal in brass and bronze.
  8. 13. Alloy of copper and zinc.
  9. 14. Coating iron with zinc to prevent rust.
  10. 15. Type of water that contains high dissolved mineral ions.
  11. 18. Method used to remove temporary hardness.
  12. 22. The insoluble substance formed when soap reacts with hard water.
  13. 23. Hardness type caused by sulfates and chlorides.
  14. 27. Low-melting alloy used to join metals.