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Iodine

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					Iodine



By: Rachel Moehlmann
Period 3
February 25, 2005
   Definition
• Iodine is a chemical element in the periodic
  table that has the symbol I. It has the atomic
  number 53.
• 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
  standard temperatures.
  Iodine turns into a
  blue-violet gas that has
  an irritating odor.
Chemical Reactions
              • Iodine dissolves easily
                in chloroform, carbon
                tetrachloride, or carbon
                disulfide. Then it forms
                a purple solution.
Physical Properties
               • The atomic mass
                 average of iodine is
                 126.9045
               • The density of iodine is
                 4.93 grams at 300
                 kilograms.
               • The boiling point of
                 iodine is 458.4K, 185.7
                 degrees Fahrenheit, and
                 185.4 degrees Celsius.
Where You Can Find This
       Element
            • Iodine is absorbed by
              seaweeds. It can be
              found in Chilean
              saltpetre, caliche, old
              salt brines, and salt
              wells.
            • Iodine occurs on land
              and in the sea. It’s in
              sodium and potassium
              compounds.
Iodine’s History
• Bernard Courtois
  discovered Iodine.
• It was discovered in
  France in the year of
  1811.
 Goiters
• 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)
  goiter
Goiter Pictures
 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.
  Glossary
• 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).
Glossary Continued...
• 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 -
    21ºC (-6ºF).
• Ha-lo-gen-An element in group 17 of the periodic table.
My Sources
• Periodic Table of Elements: Iodine - I
  (EnvironmentalChemistry.com)
• Iodine - Wikipedia, the free encyclopedia
• Chemistry : Periodic Table : key information

				
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