1. IODINE
Bio 150 Matthew Lundberg

2. History
 Name is from the Greek word iodes, meaning
violet or purple.
 Discovered by Bernard Courtois in 1811.
 Saltpeter (used to make gunpowder) was in great
demand during the Napoleonic wars. Saltpeter
produced from niter beds, require sodium carbonate an
extract of the seaweed found on the coast of Normandy.
To get the sodium carbonate the seaweed is burned.
Normally the waste is disposed of by adding sulfuric
acid. One day Bernard Courtois added more sulfuric
acid then normal and a cloud of purple vapors rose up.

3. Properties
 Melting point- 386.7 K
 Boiling point- 457.5 K
 Density g/cc- 4.93
 Less Hygroscopic- easy to work with in film.
 At room temperature Iodine is a gas
 At 20 C it is a solid.
 Metallic gray as a solid.

4. Properties
 There are 23
known Isotopes
found in nature and
only one is stable I-
127.
 The radioisotope I-
131 with a half-life
8 days has been
used to treat
thyroid disorders.

5. Availability
 Commercially Iodine is mined in Chile and
extracted from iodine-rich brines notably from
the oilfeilds in U.S. and Japan.
 Iodides are found in seawater and seaweed
which absorb the compound.
 Pure Iodine cost $8.3 per 100g

6. Uses
 Iodine is essential for a proper diet. But is only
good for your body in very small portions. You
still must be carful when handling vapor is
irritating to eyes and skin contact can cause
lesions on the skin.
 KI is used to make film
 Used as a disinfectant in many forms

7. Fun Facts
 Abundance in seawater is estimated to be
even less then .0003 parts per million.
 Least active halogen
 Heaviest element commonly used by living
organisms.
 Helps with the rate of physical and mental
development.

8. Bibliography
 Iodinefacts Anne Marie Helmenstine PHD 2011 New York Time
company Http://chemistry.about.com/od/elementfacts/a/iodine.htm
 Iodine Chemicool Periodictable Chemcool.com 2011
Http://www.chemicool.com/elements/iodine.html
 Los Alumos National laboratory (2001)