Chemistry Crossword Puzzle #2

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Across
  1. 2. Hard and shiny. usually used to conduct electricity
  2. 5. contains unequal numbers of protons and electrons
  3. 6. sulfuric acid is an example of this
  4. 7. unit of mass equal to 1/12 of the mass of a 12C atom
  5. 8. horizontal row of the periodic table
  6. 10. element in group 17
  7. 11. negatively charged atom or molecule
  8. 12. usually dull and does not conduct electricity and heat well
  9. 13. element in group 16
  10. 16. a unit equivalent to AMU
  11. 17. element in group 15
  12. 18. negatively charged particle
Down
  1. 1. conducts electricity and heat, but contains attributes of both metals and nonmetals
  2. 3. nitrate (NO2−3) is an example of this
  3. 4. vertical column of the periodic table
  4. 9. positively charged atom or molecule
  5. 12. middle of atom
  6. 14. a compound that contains water molecules
  7. 15. uncharged particle
  8. 17. positively charged particle