Chemistry choise

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Across
  1. 2. the ---- electrons are the one in the outer sheel of an atom
  2. 3. Element with atomic number 17
  3. 4. number of valence electrons of the Alkali metals
  4. 5. group of elements with 7 valence electrons
  5. 8. what do atoms do with their electrons in ionic bonds
  6. 9. A complete outer shell
  7. 10. in order to make it stable you need to --- a reaction
  8. 13. they make the structure created by Lewis
  9. 16. First part of a reaction
  10. 17. Second part of a reaction
  11. 20. A+B-> AB
  12. 21. the letters that rapresent an element
  13. 22. In order to create a combustion you need oxygen, --- and a spark
Down
  1. 1. AB->A+B
  2. 6. A covalent bond is always between two non----
  3. 7. It is formed in a covalent bond
  4. 11. name of the number of protons of an element
  5. 12. negative charged particles
  6. 14. symbol of iron
  7. 15. positive charged particles
  8. 18. first of the elements with 6 valence electrons
  9. 19. neutral particles