Fluorine
- fluorine and its compounds are
used in producing isotopically fractionated uranium (from UF6)
- commercial fluorochemicals,
including many well known high-temperature plastics
- hydrofluoric acid is
extensively used for etching the glass of light bulbs, etc.
- fluorochloro hydrocarbons are used extensively in air conditioning and refrigeration
Chlorine
- production of safe drinking
water the world over. Even the smallest water supplies are now usually
chlorinated
- extensively used in the
production of paper products, dye stuffs, textiles, petroleum products,
medicines, antiseptics, insecticides, foodstuffs, solvents, paints,
plastics, and many other consumer products
- most chlorine is used in the
manufacture of chlorinated cleaning compounds, pulp bleaching,
disinfectants, and textile processing
- manufacture of chlorates,
chloroform, carbon tetrachloride
- used for the extraction of
bromine
- PVC pipe used to provide safe
drinking water
Bromine
- Much bromine output is used in
the production of 1,2-dibromoethane (ethylene dibromide), a lead scavenger
used in making petrol antiknock compounds. Lead in petrol, however, is
presently being phased out in many countries. This will clearly affect
future production of bromine
- fumigants
- flameproofing agents
- water purification compounds
- dyes
- medicines
- inorganic bromides (AgBr) used
for photography
- pesticides
- water purification
- used to make plastics flame
retardant
Iodine
- iodide, and thyroxin which
contains iodine, are used internally in medicine. A solution of KI and
iodine in alcohol is used as a disinfectant for external wounds.
- silver iodide is used in
photography
- nutrient
- added to table salt for nutrition
{stops goitres, (Derbyshire neck)}
- deep blue colour in a starch
solution is a sign of the free element
Astatine
- none
Ununseptium.
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