Atom, Element and Periodic Table

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Across
  1. 2. a column of elements in the periodic table of the chemical elements
  2. 5. substances that made up just a single type of atom
  3. 6. chemical element with the symbol Na (english)
  4. 9. chemical element with the symbol H
  5. 11. an easier method to sort and arrange all of the elements in a table is .... table
  6. 13. part of atom that contains positive charge
  7. 14. chemical element with the symbol K (english)
  8. 15. part of atom that contains no charge
Down
  1. 1. center of the atom
  2. 3. The horizontal rows of the periodic table are called as .....
  3. 4. the smallest unit of ordinary matter that forms a chemical element
  4. 7. chemical element with the symbol O
  5. 8. chemical element with the symbol He
  6. 10. chemical element with the symbol Li
  7. 12. part of atom that contains negative charge