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The halogens are members of group 17 on the periodic table of the elements they are all highly reactive (due to their high electronegativity) and usually found as salts in nature. There are four halogens (in order of increasing atomic number; in brackets is their symbol) that occur in nature (and are present within humans): fluorine (F), chlorine (Cl), bromine (Br)[1] and iodine (I). 

Reference listEdit

  1. McCall, AS; Cummings, CF; Bhave, G; Vanacore, R; Page-McCaw, A; Hudson, BG (5 June 2014). "Bromine is an essential trace element for assembly of collagen IV scaffolds in tissue development and architecture.". Cell 157 (6): 1380–92. PMID 24906154. doi:10.1016/j.cell.2014.05.009. 

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