group 17: the halogens
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Last updated 7:54 PM on 12/13/25
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9 Terms
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properties that decrease down the group
electronegativity, electron affinity (diatomic molecules), oxidising ability
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increasing down group
Mp/Bp, atomic/ionic radii, metallic character
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electronic configuration
ns2np5
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astatine’s isotopes
all radioactive
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which bi-interhalogen combinations can be obtained pure
CIF, ICI, IBr
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use of fluorine
produce UF6
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chlorine uses
vinyl chloride polymerised to make polyvinyl chloride
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uses of bromine
leaving group in organic synthesis, used in fire retardants and pesticides
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uses of iodine
added to iodised salt. Iodine is an essential element. Dissolves in alcohol to form tincture of iodine (an antiseptic)
Note 
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