Love: A chemical reaction?

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Across
  1. 1. to be a basic component of something
  2. 4. an opportunity
  3. 7. to cause something
  4. 8. to want something badly
  5. 9. a rebellious attitude; to disobey
  6. 10. when two people feel or do the same
Down
  1. 2. a relationship of love
  2. 3. to invite someone to join a group
  3. 5. more than enough; a lot
  4. 6. preference