Atomic structure and bonding

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Across
  1. 2. An atom with 12 protons has this atomic number (5 letters
  2. 4. The number of protons in an atom is defined by its ____ number (7 letters).
  3. 7. The small particle orbiting the nucleus (8 letters)
  4. 10. The subatomic particle with a positive charge (7 letters).
  5. 11. How many elements are in aluminium oxide? (3 letters)
  6. 12. The type of bonding starting with "C" (10 letters).
  7. 13. The name for the simplest two-element compounds, ending in -ide (3 letters)
  8. 14. The type of bond between metals and non-metals (8 letters).
Down
  1. 1. The charge on an electron (8 letters).
  2. 3. The center of an atom (7 letters).
  3. 5. The particle found in the nucleus along with protons (7 letters)
  4. 6. The table where elements are organized (8 letters).
  5. 8. The element combined with calcium in calcium carbonate (6 letters).
  6. 9. Subatomic particle with no charge (8 letters).
  7. 15. Type of bond starting with "I" (8 letters)