Science

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Across
  1. 4. streak of different collord lights you sometimes see in the sky at night
  2. 6. The most expensive natural element on earth
  3. 9. least common element on earth
  4. 10. the smallest unit of an element that maintpropertieshemical proprodies of that element
  5. 11. planet that is not really considered a planet anymore
  6. 13. biggest star in our galaxy
  7. 14. Horizontal rows of elements that have the same number of electron shells
Down
  1. 1. a table of all elements found on earth
  2. 2. frozen water
  3. 3. a streak of stars you sometimes see in the sky
  4. 5. the electrons filling the outermost shell
  5. 6. vertical columns of elements that have the same amount of valance electrons
  6. 7. only planet with rings
  7. 8. planet we all live on
  8. 12. most common element on earth