Periodic Table

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Across
  1. 4. number of protons in an atom
  2. 6. elements that are brittle, dull, poor conductivity
  3. 8. unreactive gases, found in group 18 on the periodic table
  4. 9. you can pound something and it won't break
  5. 10. chart of elements showing repeating pattern of their properties
Down
  1. 1. column of elements with similar properties (18)
  2. 2. average mass of all the atoms in an element
  3. 3. property that describes a material that breaks easily
  4. 5. an element that is part metal, part nonmetal
  5. 7. elements that are shiny, malleable, ductile and conductive.