chemistry

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Across
  1. 6. symbol HE
  2. 7. neutral charge
  3. 8. atomic number 4
  4. 9. mostly gas
  5. 12. symbol FE
Down
  1. 1. brittle and dull
  2. 2. positive charge in the nucleus
  3. 3. inside of an atom
  4. 4. a bendy elememet
  5. 5. symbol LI
  6. 10. in the shell of the atom
  7. 11. symbol O