The Halogens are located one column from the far right hand side of the periodic table.
-The halogens are diatomic molecules in their
-The halogens show a number
of trends when moving down the group, for instance, decreasing electronegativity and reactivity, increasing melting and boiling
–Fluorine is pale yellow gas. It is the least dense and most chemically
active. It displaces the other halogens from their compounds and even displaces
oxygen from water. –Chlorine
is a yellow-green gas. It is more dense and less reactive than fluorine.
-Bromine is a dark red liquid.
-Iodine is a grayish black solid and is the least chemically active
of the four; however, among the nonmetals only oxygen is more reactive than iodine.
-Chlorine and iodine are both used as disinfectants for such things as drinking water, swimming pools, fresh wounds, dishes,
-Chlorine is used in many
fabric bleaches and is used to produce most paper products. –Hydrochloric
acid is very important for industrial cleaning of galvanized steel; it is also used in the creation of other chemical compounds.
-The term halogen was
coined to mean elements which produce a salt in union with a metal. It comes from 18th century scientific French nomenclature
based on erring adaptations of Greek roots.
as free elements in nature.
reactivity because of their electron configuration, ns2np5
typically found as halide ions(X-) in minerals and sea water.
does not factor into the reaction patters because all known isotopes are radioactive.
It has a short half-life of 8.3 hours.
have high electronegativity values and tend to form polar covalent bonds with other nonmetals and ionic bonds with metals
while in their lower oxidation states.
higher oxidation states form form polar covalent bonds such as TiCl4.
Halides are prepared by reacting a halogen(X2) with H2. This
halides can also be prepared by treating halide salts with an acid.
can react with each other to produce interhalogen compounds.