Chemistry homework questions

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Across
  1. 4. A large molecule is broken down into smaller molecules or atoms
  2. 6. Vertical column on the periodic table
  3. 7. An uncharged subatomic particle
  4. 9. A small piece of something, thought of as a tine hard sphere
  5. 11. The element with relative atomic mass of 12
  6. 13. A horizontal row on the periodic table
  7. 14. Shiny
  8. 15. What type of oxides do non-metals form
Down
  1. 1. Can be drawn or stretched into wires
  2. 2. The total mass of all protons and neutrons in an atom (8,6,4)
  3. 3. A subatomic particle with a positive charge
  4. 5. A group of 2 or more atoms that are chemically bonded together
  5. 8. A subatomic particle with charge of -1
  6. 10. ________ number. The number of protons in one atom of an element.
  7. 12. What type of oxides do metals form