The Periodic Table!

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Across
  1. 2. substance made of one type of atom
  2. 5. the type of reaction when a more reactive element takes the place of a less reactive one in its compound
  3. 7. element in period 3 group 2
  4. 8. the alkali metal that reacts vigorously with water but without a coloured flame
  5. 10. the line separating metals and non-metals
  6. 12. element in period 4 group 3
  7. 13. the most reactive alkali metal
  8. 14. the columns in the periodic table
  9. 15. element in period 2 group 6
  10. 16. the group number of the halogens (written in words)
  11. 19. the type of metals found in group 1
  12. 20. sodium + water --> ? + hydrogen
  13. 21. the state of matter of the group 0 elements
Down
  1. 1. the flame colour when potassium reacts with water
  2. 3. don't conduct heat or electricity and have low melting and boiling points
  3. 4. conduct heat and electricity and am found on the left of the periodic table
  4. 6. element in period 5 group 7
  5. 9. element in period 1 group 0
  6. 11. the type of metal found in group 2
  7. 17. the most reactive halogen
  8. 18. the rows across a periodic table