Periodic Table Crossword Puzzle

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