periodic table and its trend

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Across
  1. 3. eighth period of the periodic table
  2. 4. second period of the periodic table
  3. 6. are vertical rows of periodic table
  4. 10. how many valence electrons does cesium have
  5. 13. third period to 12 period of the periodic table
  6. 15. how many valence electrons does potassium have
  7. 16. how many valence electrons does rubidium have
Down
  1. 1. below the staircase
  2. 2. how many valence electrons does francium have
  3. 5. first period of the periodic table
  4. 7. how many valence electrons does hydrogen have
  5. 8. are horizontal rows of periodic table
  6. 9. how many valence electrons does sodium have
  7. 11. left side of the stairs case
  8. 12. seventh period of the periodic table
  9. 13. how many valence electrons does lithium have
  10. 14. right side of the stairs case