Dempsey's crossword

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Across
  1. 1. the name given to the vertical columns on the periodic table
  2. 4. this element has a mass number of 63.5
  3. 8. what element can be found in group 7, period 2
  4. 9. this represents the number of protons in an atoms nucleus
  5. 11. what element can be found in group 0, period 1
  6. 13. the chemical formula Lithium Hydroxide
  7. 14. the smallest part of a chemical element
  8. 16. the solution with the formula 'HCL'
Down
  1. 2. this element has an atomic number of 78
  2. 3. the elements on the right-hand side of the table are all...
  3. 5. a substance containing only one type of atom and listed on the periodic table
  4. 6. this element has an atomic number of 5
  5. 7. the elements on the periodic table are organised by this
  6. 10. this element has a mass number of 56
  7. 12. the name given to the horizontal rows on the periodic table
  8. 15. two or more atoms chemically joined together