RADIO ROCKIN' FUN!

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Across
  1. 2. Has a trunk
  2. 6. in the outermost shell
  3. 7. smallest light particle
  4. 8. Flying mammal
  5. 9. Large marsupial
Down
  1. 1. Likes to chase mice
  2. 3. virtually massless
  3. 4. a row of the periodic table
  4. 5. Man's best friend
  5. 7. positive particle