Group 17: Halogens (Periodic table #7)

The halogens are five non-metallic elements found in group 17 of the periodic table. The term "halogen" means "salt-former" and compounds containing halogens are called "salts". All of the halogens form acids when bonded to hydrogen. Most halogens are typically produced from minerals or salts. The middle halogens, that is, chlorine, bromine and iodine, are often used as disinfectants. The halogens are also all toxic. All halogens have 7 electrons in their outer shells, giving them an oxidation number of -1. The Halogens are:

  • Fluorine
  • Chlorine
  • Bromine
  • Iodine
  • Astatine
The group of halogens is the only periodic table group that contains elements in all three familiar states of matter at standard temperature and pressure
  • Solid- Iodine, Astatine
  • Liquid- Bromine
  • Gas- Fluorine, Chlorine
The artificially created element 117 (ununseptium)may also be a halogen.

Fluorine (F)
9
Image: Chlorine gas
Chlorine (Cl)
17
Image: Liquid bromine
Bromine (Br)
35
Image: Iodine crystal
Iodine (I)
53
Astatine (At)
85

CREDIT: wikipedia.org
                chemicalelements.com
DISCLAIMER: The above images don't belong to me.

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