Atoms and the periodic table

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Across
  1. 7. least reactive group on the periodic table
  2. 8. diagram that has ALL electrons
  3. 10. number of protons
  4. 11. metals with highest reactivity
  5. 12. positive subatomic particle found in the nucleus
  6. 13. center of atom
  7. 14. group 17 elements
  8. 16. substance made entirely of one type of atom
  9. 18. found on the left side
  10. 19. subatomic particle found in nucleus with no charge
  11. 21. diagram that only shows valence electrons
  12. 22. charge of electrons
  13. 23. what happens to atomic mass as you move from top to bottom of a group
Down
  1. 1. where electrons are found
  2. 2. vertical columns
  3. 3. element with 6 protons
  4. 4. smallest particle of any element that still has the properties of that element
  5. 5. found near that zigzag line
  6. 6. metals found in groups 3-12
  7. 7. found on the right side
  8. 9. electrons found in the outer shell only
  9. 15. number of valence electrons in group 15
  10. 17. tiny subatomic particle that surrounds nucleus
  11. 20. horizontal rows