Periodic Table

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123456789101112131415161718192021
Across
  1. 3. elements located by the staircase
  2. 5. number of valence electrons in group 1 elements
  3. 6. metal with 13 protons
  4. 8. metalloid in period 3
  5. 10. element with a ground state electron configuration of 2-6
  6. 13. Carbon's atomic number
  7. 15. the first element in the periodic table
  8. 16. the only group 17 element that is a liquid
  9. 18. element #12
  10. 20. period 2 element with 8 valence electrons
  11. 21. element with the largest atomic radius
Down
  1. 1. gases located in group 18
  2. 2. most electronegative element in the periodic table
  3. 4. vertical columns on the table
  4. 7. the periodic table is organized in order of increasing _____________________.
  5. 9. located in period 3, group 17
  6. 11. also known as a family
  7. 12. located to the right of the staircase
  8. 14. horizontal row on the table
  9. 15. smallest noble gas
  10. 17. number of valence electrons in an atom of nitrogen
  11. 19. the only metal that is a liquid at STP