periodic table crossword

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Across
  1. 3. has the atomic number of 74
  2. 7. has the atomic number of 17
  3. 8. has the atomic number of 46
  4. 9. has the atomic number of 26
  5. 10. The second period of the periodic table has this many elements.
  6. 12. an element that has both properties of metals and nonmetals
  7. 15. The first period of the periodic table has only this many elements.
  8. 17. has the atomic number of 5
  9. 18. This group in the periodic table contains elements with similar properties like helium and neon.
  10. 19. The first family of the periodic table is known as this
  11. 20. This group in the periodic table contains reactive metals like sodium and potassium.
Down
  1. 1. has the atomic number of 87
  2. 2. has the atomic number of 53
  3. 4. has the atomic number of 16
  4. 5. Elements in this group of the periodic table are known as alkaline earth metals
  5. 6. has the atomic number of 2
  6. 11. has the atomic number of 47
  7. 13. has the atomic number of 27
  8. 14. a chemical element in the d-block of the periodic table
  9. 16. has the atomic number of 8