What in the Periodic Table?

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Across
  1. 5. shiny & good conductors of heat and electricity
  2. 6. Name of element with the chemical symbol, Pt.
  3. 8. dull, brittle & poor conductors of heat and electricity
  4. 10. Name of element with 23 protons in its atoms.
  5. 12. share characteristics of both metals and nonmetals
  6. 13. up & down columns of periodic table; elements that share this share similar properties
Down
  1. 1. When writing the chemical symbols of elements, the first letter is always a _______.
  2. 2. Number in an element tile that represents the number of protons in the nucleus of its atom.
  3. 3. side to side rows of periodic table; atomic number increases from left to right
  4. 4. Name of element with the chemical symbol, Bi.
  5. 7. Name of element that is atomic number 41.
  6. 9. Name of element that is Group 9, Period 4.
  7. 11. Name of element that is Group 18, Period 3.