Periodic Table Challenge Crossword

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Across
  1. 3. the number of protons and electrons in an atom. located on the top of the element's box
  2. 4. the speed at which an element reacts with other substances
  3. 8. the metals of group 2
  4. 9. an arrangement of elements showing the repeating pattern of their properties
  5. 11. elements that are good conductors of electric current and heat
  6. 12. an element extremely important in its role in the chemistry of life
  7. 14. can be used to determine number of neutrons. located at bottom of element's box
  8. 17. the elements of group 17
  9. 19. rows of the periodic table, left to right
  10. 20. the elements of group 18
Down
  1. 1. the only nonmetal placed among metals on the left of the table
  2. 2. the elements in groups 3 through 12
  3. 5. an element that lacks most properties of a metal
  4. 6. one or two letters that stand for an element
  5. 7. the metals of group 1
  6. 10. one of two families set apart from the rest of the table
  7. 13. one of two families set apart from the rest of the table
  8. 15. share properties of both metals and nonmetals
  9. 16. columns of the periodic table, also known as families
  10. 18. Russian scientist, created the first version of the periodic table