The Periodic Puzzle

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Across
  1. 4. The negative electrode in electrolysis
  2. 5. Change of state from solid directly to gas
  3. 8. (Energy of activation) The minimum energy needed for a reaction to occur
  4. 10. A reddish-brown coating formed on iron due to oxidation
  5. 11. A salt or ester of phosphoric acid
  6. 13. Atoms of the same element with different numbers of neutrons
  7. 14. A negatively charged ion
Down
  1. 1. A type of chemical formula showing only bonds and arrangement
  2. 2. The chemical name for gold
  3. 3. A solid formed in a solution
  4. 4. A flask with a wide base and narrow neck used in labs
  5. 6. Describes metals that make a ringing sound when struck
  6. 7. Atoms of the same element with different numbers of neutrons
  7. 9. The combining power of an element
  8. 12. A reaction that releases heat