Periodic Table

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12345678910111213141516171819
Across
  1. 2. the four blocks on the periodic table
  2. 3. reactive metals, but less reactive than alkali
  3. 7. elements in the same group have the same # of these
  4. 10. poor conductors of heat and electricity
  5. 11. radium of an ion
  6. 12. atom or group of atoms that has a positive or negative charge
  7. 13. unreactive nonmetals
  8. 16. good conductors of heat and electricity
  9. 18. ability of atoms to attract electrons
  10. 19. columns (families)
Down
  1. 1. metals in the middle of the periodic table
  2. 4. principle that states that atoms want 8 valence electrons
  3. 5. energy required to remove an electron
  4. 6. rows
  5. 8. very reactive metals on far left of the periodic table
  6. 9. chemical & physical properties of elements repeat when they are arranged by atomic number
  7. 14. radius of an atom
  8. 15. extremely reactive nonmetals
  9. 17. have physical properties of both metals & nonmetals