Language of chemistry

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Across
  1. 2. positive ion
  2. 4. metalloid
  3. 6. variable valency
  4. 8. monovalent ion
  5. 9. combining capacity of an element
  6. 12. trivalent ion
  7. 13. noble gas
Down
  1. 1. divalent ion
  2. 3. metal
  3. 5. dioxide gas
  4. 7. hydroxide base
  5. 8. abbreviated name of the element
  6. 10. dalton figurative symbols
  7. 11. non metal