By: Rachel Moehlmann
February 25, 2005
• Iodine is a chemical element in the periodic
table that has the symbol I. It has the atomic
• This is an insoluble (not dissolvable) element
that is required as a trace for living organisms.
• Iodine is the least reactive of the halogens,
and the most electropositive metallic halogen.
• Iodine is primarily used in medicine,
photography, and in dyes.
• It was once used as an antiseptic, but is no
longer used due to its poisonous nature.
This Halogen is...
• A bluish-black, lustrous
solid that sublimes at
Iodine turns into a
blue-violet gas that has
an irritating odor.
• Iodine dissolves easily
in chloroform, carbon
tetrachloride, or carbon
disulfide. Then it forms
a purple solution.
• The atomic mass
average of iodine is
• The density of iodine is
4.93 grams at 300
• The boiling point of
iodine is 458.4K, 185.7
degrees Fahrenheit, and
185.4 degrees Celsius.
Where You Can Find This
• Iodine is absorbed by
seaweeds. It can be
found in Chilean
saltpetre, caliche, old
salt brines, and salt
• Iodine occurs on land
and in the sea. It’s in
sodium and potassium
• Bernard Courtois
• It was discovered in
France in the year of
• There are different kinds of goiters. A simple
goiter usually occurs when the thyroid gland does
not produce enough thyroid hormone. The
thyroid gland then enlarges, and can overcome the
shortage of thyroid hormone.
• A simple goiter may be classified as either an
endemic (colloid) goiter or a sporadic (nontoxic)
More Info. on Goiters….
• Endemic goiters occur within people living in
geographical areas with iodine-depleted soil.
These regions are usually away from the sea
coast. People in these communities might not
get enough iodine in their diet. (Iodine is vital
to the formation of thyroid hormone.) The
modern use of iodized table salt in the U.S.
prevents this deficiency. This disease is still
common in central Asia and Africa.
• En-dem-ic-Prevalent in or peculiar to a particular locality, region, or people:
diseases endemic to the tropics.
• Ge-o-gra-phi-cal-Geographical means relative to the coordinates on Earth that are
based on the rotation axis of the Earth. The geographical poles are the places where the
rotation axis of the Earth penetrates the surface; those are commonly called the north and
south poles. Geographical coordinates are the longitude and latitude.
• De-fic-I-en-cy-Lack, deficiency, want -- (the state of needing something that is absent
or unavailable; "there is a serious lack of insight into the problem"; "water is the critical
deficiency in desert regions"; "for want of a nail the shoe was lost")
2. insufficiency, inadequacy, deficiency -- (lack of an adequate quantity or number; "the
inadequacy of unemployment benefits")
• De-ple-ted-Consume, eat up, use up, eat, deplete, exhaust, run through, wipe out -- (use
up (resources or materials).
• Thy-roid-The thyroid is a large endocrine gland situated in the base of the neck; it is
concerned with regulation of the metabolic rate.
• Spo-ra-dic-Occuring at irregular intervals, having no pattern or order.
• Su-blimes-sublimate -- Change or cause to change directly from a solid into a vapor
without first melting; "sublime iodine"; "some salts sublime when heated”.
• E-lec-tro-pos-i-tive-Having a positive electric charge; "protons are positive”.
• Salt-Brines-The most cost effective prewetting and liquid solutions can be made from
sodium chloride (NaCl) and water (H2O) to form a salt brine. The eutectic composition of
sodium chloride & water is 23% NaCl and 77% H2O by weight, which freezes at about -
• Ha-lo-gen-An element in group 17 of the periodic table.
• Periodic Table of Elements: Iodine - I
• Iodine - Wikipedia, the free encyclopedia
• Chemistry : Periodic Table : key information