My crossword

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Across
  1. 2. the central part of an atom
  2. 3. what we're learning right now
  3. 5. Element 14
  4. 7. Element 122
  5. 8. They have no charge
Down
  1. 1. Element 83
  2. 4. 2 or more substances
  3. 6. bonding 2 or more chemical elements