Atoms, elements and compounds

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