Periodic Table Crossword Puzzle

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Across
  1. 4. the physical property of heat and electricity
  2. 7. a physical property of metals
  3. 13. number of vertical columns on the periodic table
  4. 14. the number of periods on the periodic table
  5. 16. drawn into thin wires
  6. 17. something that can be hammered into thin sheets
  7. 19. which side of the periodic table are the metals
  8. 20. horizontal rows on the periodic table
  9. 21. the number of elements on the periodic table
Down
  1. 1. how many elements are found on the first row of the periodic table
  2. 2. 1st element of the periodic table
  3. 3. vertical columns on the periodic table
  4. 5. a one or two-letter abbreviation of the element's name
  5. 6. found on the right side of the periodic table
  6. 8. located on the stair step line of the periodic table
  7. 9. a physical property of nonmetals
  8. 10. the inventor of the periodic table
  9. 11. elements that are typically solid, shiny, malleable
  10. 12. the smallest unit of matter that forms an element
  11. 15. the chemical symbol for sodium
  12. 18. appears above the symbol for the element