Periodic table

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Across
  1. 4. Vertical columns on the periodic table (6)
  2. 5. The only non-metal liquid element at RTP (7)
  3. 6. Group 7 (8)
  4. 8. The most reactive halogen (8)
  5. 9. The least reactive metal in Group 1 (7)
  6. 10. The element in Period 3, Group 7 (8)
  7. 12. The block between groups 2 and 3 (10,8)
  8. 14. Group 0 (5,5)
  9. 16. The only metallic liquid element at RTP (7)
Down
  1. 1. Horizontal rows on the periodic table (7)
  2. 2. The element in Period 2, Group 3 (5)
  3. 3. Element munger 1 (8)
  4. 7. Elements are listed in this order (6,6)
  5. 11. The element in Period 4, Group 2 (7)
  6. 13. Group 1 (3,6,6)
  7. 15. Approximately 80% of the elements. (6)