Periodic table crossword

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Across
  1. 2. The center of an atom
  2. 5. A negatively charged particle in the nucleus of an atom
  3. 7. Poor conductors
  4. 8. The abbreviation used for the elements
  5. 11. Symbol of Si
  6. 13. A horizontal column on the periodic table
  7. 14. In group 7 , period 2
  8. 15. number The number of protons in the nucleus of an atom
Down
  1. 1. Used in balloons
  2. 3. The smallest part of an element
  3. 4. earth metals Strong conductors
  4. 6. A vertical column on the periodic table
  5. 9. an element that has properties between metals and nonmetals
  6. 10. A positively charged particle in the nucleus of an atom
  7. 12. A neutral particle in the nucleus of an atom