Periodic Table Crossword

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Across
  1. 3. what is the number in the top left corner?
  2. 5. All elements in order to become energetically stable Desire 8 valence electrons
  3. 10. What is the number at the very bottom of the box?
  4. 13. what is the 2nd element down in the noble gasses?
  5. 15. What is the block called on the last two periods?
  6. 17. what is group number 1 called?
  7. 18. what has the Atomic Mass Number of 6.941?
  8. 19. What has the Atomic Mass of 131.294?
  9. 20. What is group 17 called?
  10. 21. What element has the Atomic Number of 29?
Down
  1. 1. what has the Atomic Number of 17?
  2. 2. What element has the Atomic Number 47?
  3. 4. What follows the staircase?
  4. 6. What element is in the very top left?
  5. 7. What has the element symbol of Na?
  6. 8. What is the word called underneath the symbol?
  7. 9. Are organized based on which energy level an element places its valence electron
  8. 11. what is the top element in the column with 6 Valence Electrons?
  9. 12. What is the name of the element with the symbol CO?
  10. 14. what are the letters that represent the element called?
  11. 16. what has the Atomic Number of 50?