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The periodic table, image, image, WhatsApp Image 2020-06-09 at 10.03.22,…

- - - - Mostly bridges and cars or even buildings
  - - - Iron, Copper and Nickel.
- - - - The iron wool bursts into flame as fluorine passes over it without any heating
    - - hot iron wool glows when vapor passes through it
    - - Hot iron wool shows faint red glow when iodine vapor passes over it
    - - The iron wool bursts into flame as fluorine passes over it without any heating
  - - - Boiling point: -188
    - - Boiling point: 59
    - - Boiling point: -135
- - - - They don't react to anything
    - - Argon
      - Helium
      - Neon
  - - - This made them safe.