nuclear

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Across
  1. 2. obligate
  2. 4. the title of a song by imagine dragons
  3. 5. the act of switching two things
  4. 6. reaction with oxygen
  5. 7. the parts of something; the things listed in the periodic table
  6. 9. previous
  7. 11. efficient in carrying out it’s designed
  8. 14. in the background or the environment
  9. 17. between the starts
  10. 18. consisting of organic compounds H,O,N,C
  11. 19. not following what is done or considered normal or acceptable by most people
Down
  1. 1. the amount of something
  2. 3. broken down to distinct and equal amounts
  3. 5. a range of levels or numbers used for measuring something
  4. 8. 90’s element in the periodic table
  5. 10. not prone to failure
  6. 12. the information uncovered by an investigation
  7. 13. to take out of something
  8. 15. officially stop using something
  9. 16. kind and gentle; not hurting anybody