The Periodic Crossword Puzzle

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Across
  1. 2. one of the elements of Group 17 of the periodic table
  2. 7. the law that states that the repeating chemical and physical properties of elements change periodically with the atomic numbers of the elements
  3. 8. one of the elements of Group 1 of the periodic table
  4. 9. He determined the number of protons-the atomic number- in an atom
  5. 10. Group 15
  6. 15. an element that has properties of both metals and nonmetals
  7. 16. Groups 3-12
  8. 18. another term for metalloids
  9. 19. one of the elements of group 18 of the periodic table
Down
  1. 1. an element that conducts heat and electricity poorly
  2. 3. an element that is shiny and that conducts heat and electricity well
  3. 4. a vertical column of elements in a group share chemical properties
  4. 5. in chemistry, a horizontal row of elements in the periodic table
  5. 6. Group 14
  6. 8. one of the elements of Group 2 of the periodic table
  7. 11. elements that undergo a process that allows them to combine to form into compounds
  8. 12. describes something that occurs or repeats at regular intervals
  9. 13. another term for group
  10. 14. a man who played chemical solitaire and made a table that became the Periodic table of the elements
  11. 17. this was the name of the noble gases because scientists thought they would not reactive.