Chemistry Crossword

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Across
  1. 2. negatively charged ion
  2. 3. it has atomic mass 23u
  3. 6. anything that has mass and occupies space
  4. 8. unit used to measure mass of an atom
  5. 11. having one shell which is complete
  6. 12. charge on an atom
  7. 13. has two valencies one and two
  8. 15. cation with valency three
  9. 17. combining capacity of an element
  10. 18. short hand representation for an element
Down
  1. 1. silver colour ribbon
  2. 4. same atomic number different atomic mass
  3. 5. molecule which contains three atoms
  4. 7. having two shell with seven valence electrons
  5. 9. it's atomic number is 15
  6. 10. symbol is Sn
  7. 14. group of atoms having a common charge
  8. 16. neutral particle in the centre of an atom