Periodic table crossword

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Across
  1. 2. Which element is in period 4, group 0?
  2. 9. The smallest particle of an element that can exist.
  3. 10. Is lithium or calcium an alkali metal?
  4. 11. Shows all the elements arranged in rows and columns.
  5. 12. Rows in the periodic table
  6. 13. Two to thousands of atoms joined together. Most non-metals exist either as small or giant molecules.
  7. 14. the chemical symbol for sodium
  8. 16. Features of a substance that can be observed
  9. 17. the chemical symbol for calcuim
Down
  1. 1. Pure substances made up of two or more elements strongly joined together.
  2. 3. What element does K represent
  3. 4. what all substances are made up of, and which contain only one type of atom.
  4. 5. The name of the elements in group 7
  5. 6. Is chlorine or helium a halogen?
  6. 7. Columns in the periodic table
  7. 8. The name of the elements in group 1
  8. 15. The name for the elements in group 0