Chemistry C4

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Across
  1. 2. the vertical column in the periodic table.
  2. 4. the second stage of purifying water.
  3. 9. the rows across in the periodic table.
  4. 10. a bond between two non metals.
  5. 12. the first stage in purifying water.
  6. 13. the group 7 elements.
  7. 14. an atom with a different number of neutrons to protons and electrons.
  8. 15. a bond between a metal and non metal.
  9. 16. purification the forth stage of purifying water.
  10. 17. a way to test for a metal.
Down
  1. 1. the thing at the centre of the atom.
  2. 3. the third stage of purifying water.
  3. 5. negatively charged, the same number as the protons.
  4. 6. neutrally charged.
  5. 7. the number of protons and electrons in an atom.
  6. 8. positvely charged, the same number as the electrons.
  7. 11. the group 1 elements.
  8. 18. the thing the elctrons are in.