chemistry puzzle

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Across
  1. 3. an atom, molecule or ion with least unpaired electron
  2. 4. a metal made by mixing two different metals
  3. 5. an ion with a negative charge
  4. 7. no of valence electron that participate in chemical reaction
  5. 8. process in which insoluble substance is left
  6. 10. a noble gas
  7. 11. an ion with a positive charge
Down
  1. 1. no of atom present in molecule or atom
  2. 2. a substance that cannot broken further
  3. 3. a substance that react during chemical reaction
  4. 6. substance made up of one kind of atom
  5. 8. a substance that we get after a chemical reaction
  6. 9. repetition of a property in periodic table
  7. 12. basic building block o chemistry