nuclear

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Across
  1. 2. previous
  2. 3. the act of switching two things
  3. 5. a range of levels or numbers used for measuring something
  4. 6. in the background or the environment
  5. 7. the title of a song by imagine dragons
  6. 8. the amount of something
  7. 11. broken down to distinct and equal amounts
  8. 12. efficient in carrying out it’s designed
  9. 15. consisting of organic compounds H,O,N,C
  10. 16. reaction with oxygen
  11. 17. not prone to failure
  12. 19. the parts of something; the things listed in the periodic table
  13. 20. 90’s element in the periodic table
Down
  1. 1. officially stop using something
  2. 4. not following what is done or considered normal or acceptable by most people
  3. 9. between the starts
  4. 10. obligate
  5. 13. the information uncovered by an investigation
  6. 14. to take out of something
  7. 18. kind and gentle; not hurting anybody