Periodic Table Crossword

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Across
  1. 2. this family increases reactivity going down
  2. 5. An electron that is located in the outer most energy level of an atom
  3. 8. it's strength increases, it also decreases
  4. 9. This has the MOST electron shells in the family of noble gases
  5. 10. measure of how much a substance reacts when it is mixed with another substance
  6. 12. This family group has 7 valence electrons
  7. 14. the atomic number increases across a period and down the group
  8. 17. the net positive charge felt by valence electrons from the nucleus
  9. 18. this has the most atomic radius in the family of alkali mental
  10. 20. Its a measure of the size of it's atom usually the mean or typical distance from the center of the nucleus
Down
  1. 1. Tendency of an atom to attract electrons towards itself
  2. 3. decreases across a period moving from left to right
  3. 4. this group follows the trends alkali metals, just a little less reactive
  4. 6. this group is used to prevent chemical reactions
  5. 7. elements are arranged in 7 horizontal rows, in order of increasing atomic number from left to right and top to bottom
  6. 11. this has the least valence electron in the family of alkali metals
  7. 13. this has the most electronegativity in the family of halogens
  8. 15. a pattern of change
  9. 16. regions surrounding the atomic nucleus containing a specific number of electrons
  10. 19. someone who predicated the discovery of properties of several atoms