Chemistry

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Across
  1. 2. i am black and i form diamond as i age
  2. 6. i am yellow and worn by everyone as jewelry
  3. 8. i am a laughing gas
Down
  1. 1. salt
  2. 3. you breath me
  3. 4. i am bright and shiny and used in jewelry
  4. 5. i fill your balloons and it floats
  5. 7. i am pinky and i dance on water