Atoms, elements and compounds

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Across
  1. 4. a positively charged particle
  2. 5. this is the name of group 2 on the periodic table
  3. 6. the negatively charged particle
  4. 9. a substance that only contains one type of atom
  5. 10. this group gets more reactive as you go down its group
  6. 12. the neutral part of an atom
Down
  1. 1. this group gets less reactive as you go down its group
  2. 2. the side that the non-metals are on the periodic table
  3. 3. the smallest part of an element that can exist
  4. 7. this is the name of group 8 on the periodic table
  5. 8. the side that the metals are on the periodic table
  6. 11. a substance made from more than one type of atom joined together