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________ is a highly reactive halogen.
1. Fluorine
2. Chlorine
3. Bromine
4. Iodine

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Correct Answer - Option 1 : Fluorine

The correct answer is Fluorine.

  • Fluorine:
    • Fluorine was first discovered in 1886 by isolating it from Hydrofluoric acid.
    • Fluorine has an atomic number of 9 and is denoted by the symbol F.
    • Fluorine exists as a diatomic molecule in its free state(F2).
    • It is the most abundant halogen found in the Earth's Crust.
    • Fluorine is the most electronegative element in the Periodic table.
    • It appears as a pale yellow gas at room temperature.
    • It is extremely reactive and reacts directly with all the elements except helium(He), Neon(Ne), and argon(Ar).
  • General Properties of Halogen:
    • ​Halogen is located on the left of the Noble gases on the Periodic table.
    • The elements which are present in group 17 of the Halogen group are:
      • Fluorine, Chlorine, Bromine, Iodine, and Astatine.
    • Halogen does not exist in a free state.
    • Halogen exists in all different states of matter.
    • The halogen of group 17 exhibits different colors.

Halogen Color in water Organic Solvent
Fluorine Yellow Yellow
Chlorine Greenish Yellow Green
Bromine Reddish Brown Brown
Iodine Brown Purple

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