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Halogen are 17th group element.......they consist of mainly gases 
F,CL,BR,I,AT ARE its example

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Halogen are the 17th group element they are highly electronegative and has smallest size they have to gain one electron to compelete their octet
example are flurine chlorine,bromine,iodine,
they always occur in molecular form in nature

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oh..nice answer..#parth..lol.. ;P
Thanks parth
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