Periodic Table Crossword Puzzle

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