Periodic table crossword puzzle

1234567891011121314
Across
  1. 2. elements in group 17 of the pt
  2. 6. an electrally charged atom
  3. 9. a table of chemical elements ordered by atomic number
  4. 10. elements located on the "staircase" of the pt
  5. 12. where electrons can be found
  6. 13. horizontal rows
  7. 14. elements in group 18 of the pt
Down
  1. 1. elements in group 1 pf the pt
  2. 3. the smallest unit of an element
  3. 4. vertical colums
  4. 5. a subatomic partical with a neutral charge
  5. 6. elements with the same number of protons but different neutrons
  6. 7. a subatomic particle with a positive charge
  7. 8. a subatomic partical with a negative charge
  8. 11. elements on the left side of the pt