1st week crossword puzzle

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Across
  1. 3. valency of oxygen is
  2. 4. in periodic table we find
  3. 6. circular path present around the nucleus
  4. 7. combining capacity
  5. 8. can not exist independently
  6. 10. negative charge particle of a atom is
  7. 11. atoms combine to form
  8. 13. total number of protons
  9. 14. elements combines to form
Down
  1. 1. central part of atoms is
  2. 2. shape of atom
  3. 5. can exist independently
  4. 6. short hand notation of element is
  5. 9. matter exist in
  6. 10. revolving around the nucleus
  7. 12. can not be divided further