science

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Across
  1. 3. we breathe it every second of the day, its atomic mass is 15.999 u
  2. 5. is the 20th element, for muscles to move and for nerves to carry messages between your brain and every part of your body
  3. 6. used in rust removers, used in matches
  4. 8. used to make salt, its atomic mass is 22.989769 u
  5. 9. used to make nuclear weapons, used in the making of x-ray machines
  6. 12. used to support muscle and nerve function, is the 11th element
  7. 14. used to make one of the coldest things in the world, used to make explosives
  8. 15. used to make pesticides, its atomic mass is 10.811 u
  9. 16. used in cans, used in a certain foil
  10. 18. used to make sulfuric acid, its atomic mass is 32.065 u
  11. 19. it comes out of when you breathe out, it's the 6th element
Down
  1. 1. is used to fill party balloons, its atomic mass is 4.002602 u
  2. 2. used to disinfect water, used to make bleach
  3. 4. bananas have it, its atomic mass is 39.0983 u
  4. 7. is the first element, its atomic mass is 1.00784 u
  5. 10. used in plasma, it's the 9th element
  6. 11. was used to treat mania, it's the third element
  7. 13. used to make titanium, is the 18th element
  8. 17. used in bright glowing signs, used in traffic lights
  9. 18. used in the making of computer chips, is the 14th elements