Chem Crossword

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Across
  1. 3. Bi
  2. 6. Sn
  3. 8. A type of change that changes the makeup of the substance
  4. 9. Zn
  5. 10. A charged atom
  6. 12. (CN)-1
  7. 13. negatively charged elements;non-metals
  8. 15. Pb
  9. 16. The elements along the stairs excluding aluminium
  10. 18. an alloy of copper and zinc
  11. 19. heat is absorbed
  12. 20. A type of table that organizes elements
Down
  1. 1. (MnO₄)-1
  2. 2. atoms of the same element that have a different number of neutrons
  3. 4. Very reactive non-metal group with a -1 charge
  4. 5. pure substance made up of two or more elements
  5. 7. Ag
  6. 11. 3D sphereic structure in an atom
  7. 12. positively charged metal
  8. 14. The metals in the first column of the periodic table
  9. 17. Mass per unit volume