u2.1

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Across
  1. 1. how far the outermost shell is from the nucleus
  2. 6. columns
  3. 7. electronegativity, ionization energy, etc.
  4. 9. group 1 on the periodic table
  5. 10. rows
Down
  1. 2. group 2 on the periodic table
  2. 3. the most stable group
  3. 4. group of metals that are found in the middle of the periodic table
  4. 5. group 17 on the periodic table
  5. 8. outermost electrons