The periodic table

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Across
  1. 3. the number of electrons in a full energy level
  2. 4. ion with positive charge
  3. 8. ion with negative charge
  4. 9. the number of valence electrons in the halogen group
  5. 10. a light gas used to fill balloons
  6. 13. the number of groups in the periodic table
  7. 15. the number of electrons in the first energy level
  8. 18. the name of the inventor of the periodic table
Down
  1. 1. the 17th group of elements
  2. 2. name of a horizontal set of elements in the periodic table
  3. 5. elements arrangement in the periodic table is according to the…
  4. 6. gases – least reactive elements
  5. 7. electrons in the last energy level
  6. 11. an atom that lost or gained an electron
  7. 12. the most abundant type of elements in the periodic table
  8. 14. name of a vertical set of elements in the periodic table
  9. 16. the rule that is responsible for chemical reactions
  10. 17. metals – group of elements with one valence electron