Periodic table and atom puzzle

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Across
  1. 3. O on the periodic table
  2. 6. negative charge
  3. 8. the big 1 or 2 letters that are on the element
  4. 9. K on the periodic table
  5. 12. the least amount of elements
  6. 13. neutral
  7. 15. the side-to-sidelines of elements
Down
  1. 1. the majority of the periodic table
  2. 2. positively charged
  3. 4. He on the periodic table
  4. 5. the smallest particles of elements
  5. 7. the up and down lines of elements
  6. 10. is the whole number that is on the element
  7. 11. staircase on the periodic table
  8. 14. gases that don't react with other gases