Elements Puzzle

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Across
  1. 2. most reactive nonmetals
  2. 7. shiny metals
  3. 8. harder, denser, stronger than alkali earth metals.
  4. 12. Alkali metals react strongly with _____.
  5. 13. Transition metals are good conductors of ___________.
  6. 15. semiconductors, brittle
  7. 16. stable in the presence of air
Down
  1. 1. Alkali metals are strong enough to cut with a ______.
  2. 3. than Alkali metals.
  3. 4. are all radioactive
  4. 5. Alkaline-earth metals have higher melting points than ______ ______.
  5. 6. Alkali metals are not found in nature as ____ _______.
  6. 9. Transition metals have higher ______.
  7. 10. What are unreactive, and exist as free elements in nature?
  8. 11. properties vary greatly
  9. 14. Alkaline-earth metals are not found in ______ as free elements.