Chemistry Crossword

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Across
  1. 3. stable subatomic particle with a positive charge
  2. 8. sharing of free electrons among positively charged ions
  3. 12. subatomic particle with a negative charge
  4. 13. row of elements on the periodic table
  5. 14. large enough to be seen by the unaided eye
Down
  1. 1. a covalent bond between two atoms with an unequal sharing of electrons
  2. 2. subatomic particle with no charge
  3. 4. substance with an identical composition
  4. 5. a substance composed of different components
  5. 6. a chemical change dealing with melting or freezing
  6. 7. the molecular geometry of N2
  7. 9. set of eight valence electrons
  8. 10. the name for H2O
  9. 11. column of elements on the periodic table
  10. 15. atom or molecule with a net electric charge by a loss or gain of an electron(s)