periodic table

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Across
  1. 2. in a atom
  2. 4. elements
  3. 6. extra electrons
  4. 10. outside of the nuclius
Down
  1. 1. mmatter
  2. 3. in a atom
  3. 5. mass of an atom
  4. 7. melting
  5. 8. boiling
  6. 9. frezing