Chemistry

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Across
  1. 3. Precious grey metal (6)
  2. 5. Smallest particle of an element (4)
  3. 6. positive particle (7)
  4. 7. precious yellow metal (4)
  5. 10. subatomic particle(7)
Down
  1. 1. negative particle (9)
  2. 2. Wire in electrical fire (7)
  3. 4. two or more elements bonded (8)
  4. 6. Atomic number 78 (8)
  5. 8. precious gem (7)
  6. 9. two or more of any atoms bonded (8)