By: Madi Reynolds

What are they?

Halogens are five non-metallic elements, Fluorine, Chlorine, Bromine, Iodine, and Astatine, found in group 17 of the periodic table. All halogens have 7 electrons electrons in their outer shells, giving them an oxidation number of -1. At room temperature, halogens exist in all three states of matter.

What are they used for?

Halogens are found in:

  • pool water
  • toothpaste
  • disinfectant
  • pesticides
  • dyes
  • soaps
  • picture film
  • medicine

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