Periodic Table

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Across
  1. 2. rows
  2. 4. reactive metals, but less reactive than alkali
  3. 7. unreactive nonmetals
  4. 8. very reactive metals on far left of the periodic table
  5. 9. poor conductors of heat and electricity
  6. 11. chemical & physical properties of elements repeat when they are arranged by atomic number
  7. 14. elements in the same group have the same # of these
  8. 19. metals in the middle of the periodic table
Down
  1. 1. principle that states that atoms want 8 valence electrons
  2. 3. radium of an ion
  3. 5. radius of an atom
  4. 6. ability of atoms to attract electrons
  5. 10. good conductors of heat and electricity
  6. 12. extremely reactive nonmetals
  7. 13. energy required to remove an electron
  8. 15. the four blocks on the periodic table
  9. 16. have physical properties of both metals & nonmetals
  10. 17. atom or group of atoms that has a positive or negative charge
  11. 18. columns (families)