The Periodic Puzzle

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Across
  1. 2. A polyatomic anion that contains 1 atom of Phosphorus and 4 atoms of Oxygen
  2. 4. The chemical name for Gold
  3. 6. (Energy of activation) The minimum energy needed for a reaction to occur
  4. 7. A reddish-brown coating formed on iron due to oxidation
  5. 8. The combining power of an element
  6. 9. Change of state from solid directly to gas
  7. 11. A insoluble solid formed in a solution
  8. 12. Describes metals that make a ringing sound when struck
  9. 13. A reaction that releases heat
  10. 14. Atoms of the same element with different numbers of neutrons
Down
  1. 1. A flask with a wide base and narrow neck used in the lab
  2. 3. A positivly charged ion
  3. 5. Positivly charged ions are attracted to this electrode during electrolysis
  4. 10. Atoms of the same element with different numbers of neutrons
  5. 12. A type of chemical equation that does not follow the 'Law of Conservation of Mass'