The missing elements

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Across
  1. 4. used to make medals
  2. 6. lets heat pass trough
  3. 7. has low density
  4. 8. consistuents is copper and zinc
  5. 9. can be shaped by applying pressure
  6. 12. producing sound when hit
  7. 13. properties of a non-metal and metal
  8. 15. right side of periodic table
Down
  1. 1. can be drawn out into thin wire
  2. 2. a term for heat
  3. 3. shiny and sonorous
  4. 5. blocks the path of electricity
  5. 10. Corroresistant
  6. 11. another term for shiny
  7. 14. an alloy with consisting of mercury