Chemistry

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Across
  1. 4. number of protons in nucleus
  2. 6. smallest indivisible part of an element
  3. 9. formed when a metal gives 1+ electrons to a non-metal so they both have full outer shells
  4. 10. more reactive halogens........ less reactive ones
  5. 12. giant ionic crystal
  6. 14. simple covalent substance (CH4)
  7. 19. group 7
  8. 21. formed when metals become cations in a sea of electrons
  9. 23. smallest mass and orbit the nucleus of an atom
  10. 24. 2+ atoms covalently bonded together
  11. 26. positive ion
  12. 28. group 0
  13. 29. columns in periodic table
Down
  1. 1. elements that exist as 2 atoms
  2. 2. burns red when in contact with air/oxygen
  3. 3. metals which form coloured compounds and complex ions
  4. 4. group 2
  5. 5. rows in periodic table
  6. 7. table with all atoms in it
  7. 8. these forces are weak between covalent molecules
  8. 11. 2+ atoms chemically joined together
  9. 13. formed when 2+ atoms share electrons
  10. 15. halogen ion
  11. 16. noble gases are very ........
  12. 17. poor conductor low melting point
  13. 18. giant covalent structure, hardest substance known to man
  14. 20. group 1
  15. 22. formed by gain or loss of electrons
  16. 24. good conductor, high melting point
  17. 25. made up of 1 type of atom only
  18. 27. total mass of protons and neutrons in an atom