Atomic stucture

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Across
  1. 3. the table that orders the elements
  2. 8. the center of an atom
  3. 9. a subatomic particle with a positive charge
  4. 10. a negative ion
  5. 11. an element with the symbol of Li
  6. 12. an element with the symbol of He
Down
  1. 1. an element with the symbol of Cl
  2. 2. an element with the symbol of Na
  3. 4. a positive ion
  4. 5. a subatomic particle with a negative charge
  5. 6. a subatomic particle with a neutral charge
  6. 7. an element with the symbol of Mg