Periodic Table Puzzle

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Across
  1. 3. Hydrogen is this
  2. 5. First person to create a unpublished table
  3. 6. Boron is this
  4. 9. Most reactive nonmetals
  5. 12. Contains properties of both metals and nonmetals
  6. 13. Nonreactive
  7. 14. Known as rare earth metals
  8. 15. Great conductors
  9. 16. Iron is this
Down
  1. 1. Arranged by increasing atomic mass
  2. 2. Most reactive metals
  3. 4. Relatively soft
  4. 7. Good conductors of heat and electricity
  5. 8. Poor conductors
  6. 10. Are all radioactive
  7. 11. Arranged by increasing atomic number