Periodic Table

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Across
  1. 4. An element whose properties are intermediate between those of metals and solid nonmetals or semiconductors
  2. 5. The only periodic table group that contains elements in all three familiar states of matter at standard temperature and pressure
  3. 6. Natural materials that do not produce heat or electricity and that are structurally brittle
  4. 7. Ductile and malleable, but they do not have different oxidation states since their valence electrons are only in the outer shell
  5. 9. All are radioactive and the heavier members are extremely unstable and not of natural occurrence
Down
  1. 1. Under standard conditions they are all odorless, colorless, monoatomic gases with very low chemical reactivity
  2. 2. Shiny, silver-colored transition metals
  3. 3. Very reactive, electropositive, monovalent metals
  4. 8. Many of their compounds are colored