iodine

 1. Element Name: Iodine 2. Element Symbol: I 3. Atomic Number: 53 4. Most Common Mass Number: 126.9045 5: Physical State: Solid at 298 K 6: Latin Name: Iodum 7: Uses of Element: Required in small amounts by humans. Used as a disinfectent, too much can be poisonous. 8: Biological Importance: Iodine is needed in a human's diet and also is used in medicine 9: Who Discovered Iodine: Bernard Courtois 10: How it was Discovered: Courtois isolated iodine from treating seaweed ash with sulphuric acid 11: Physical Properties: Melting Point - 236.66 F, Molar Volume - 25.72 cm3, Density of Solid - 4940 kg m-3 12: Chemical Properties: 13: Common Compounds: Iodine Flouride, Iodine Chloride, Diiodine Pentaoxide 14: Common Ions: 15: Isotopes: 16: 17: http://speringelements.wikispaces.com/selenium Cited Works:
 * http://environmentalchemistry.com/yogi/periodic/I.html
 * http://webelements.com/iodine/isotopes.html
 * Chemistry Book