Periodic Table Crossword Puzzle

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Across
  1. 7. Element at group 1, period 4
  2. 9. Family name for group 2
  3. 10. Family name for group 18
  4. 12. Last name of chemist who grouped elements by atomic number
  5. 15. Metal with atomic number of 26
  6. 16. Last name of chemist who grouped elements based on similar mass and properties
  7. 17. Metalloid with an atomic number of 5
Down
  1. 1. Family name for group 1
  2. 2. Family name for group 17
  3. 3. Name for vertical columns
  4. 4. Elements that are dull with poor conductivity
  5. 5. Majority of the elements are classified as
  6. 6. Name for horizontal rows
  7. 8. Family name for groups 3-12
  8. 11. Our periodic table is listed in order of increasing
  9. 13. Nonmetal with atomic number of 53
  10. 14. Elements in the stair-step