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Iodine,  53I
Sample of iodine.jpg
General properties
Name, seembol iodine, I
Appearance lustrous metallic gray, violet as a gas
Pronunciation /ˈ.ədn/ EYE-ə-dyn,
/ˈ.ədn/ EYE-ə-dən,
or /ˈ.ədn/ EYE-ə-deen
Iodine in the periodic cairt
Hydrogen (diatomic nonmetal)
Helium (noble gas)
Lithium (alkali metal)
Beryllium (alkaline yird metal)
Boron (metalloid)
Carbon (polyatomic nonmetal)
Nitrogen (diatomic nonmetal)
Oxygen (diatomic nonmetal)
Fluorine (diatomic nonmetal)
Neon (noble gas)
Sodium (alkali metal)
Magnesium (alkaline yird metal)
Aluminium (post-transeetion metal)
Silicon (metalloid)
Phosphorus (polyatomic nonmetal)
Sulfur (polyatomic nonmetal)
Chlorine (diatomic nonmetal)
Argon (noble gas)
Potassium (alkali metal)
Calcium (alkaline yird metal)
Scandium (transeetion metal)
Titanium (transeetion metal)
Vanadium (transeetion metal)
Chromium (transeetion metal)
Manganese (transeetion metal)
Airn (transeetion metal)
Cobalt (transeetion metal)
Nickel (transeetion metal)
Capper (transeetion metal)
Zinc (transeetion metal)
Gallium (post-transeetion metal)
Germanium (metalloid)
Arsenic (metalloid)
Selenium (polyatomic nonmetal)
Bromine (diatomic nonmetal)
Krypton (noble gas)
Rubidium (alkali metal)
Strontium (alkaline yird metal)
Yttrium (transeetion metal)
Zirconium (transeetion metal)
Niobium (transeetion metal)
Molybdenum (transeetion metal)
Technetium (transeetion metal)
Ruthenium (transeetion metal)
Rhodium (transeetion metal)
Palladium (transeetion metal)
Siller (transeetion metal)
Cadmium (transeetion metal)
Indium (post-transeetion metal)
Tin (post-transeetion metal)
Antimony (metalloid)
Tellurium (metalloid)
Iodine (diatomic nonmetal)
Xenon (noble gas)
Caesium (alkali metal)
Barium (alkaline yird metal)
Lanthanum (lanthanide)
Cerium (lanthanide)
Praseodymium (lanthanide)
Neodymium (lanthanide)
Promethium (lanthanide)
Samarium (lanthanide)
Europium (lanthanide)
Gadolinium (lanthanide)
Terbium (lanthanide)
Dysprosium (lanthanide)
Holmium (lanthanide)
Erbium (lanthanide)
Thulium (lanthanide)
Ytterbium (lanthanide)
Lutetium (lanthanide)
Hafnium (transeetion metal)
Tantalum (transeetion metal)
Tungsten (transeetion metal)
Rhenium (transeetion metal)
Osmium (transeetion metal)
Iridium (transeetion metal)
Platinum (transeetion metal)
Gold (transeetion metal)
Mercur (transeetion metal)
Thallium (post-transeetion metal)
Leid (post-transeetion metal)
Bismuth (post-transeetion metal)
Polonium (post-transeetion metal)
Astatine (metalloid)
Radon (noble gas)
Francium (alkali metal)
Radium (alkaline yird metal)
Actinium (actinide)
Thorium (actinide)
Protactinium (actinide)
Uranium (actinide)
Neptunium (actinide)
Plutonium (actinide)
Americium (actinide)
Curium (actinide)
Berkelium (actinide)
Californium (actinide)
Einsteinium (actinide)
Fermium (actinide)
Mendelevium (actinide)
Nobelium (actinide)
Lawrencium (actinide)
Rutherfordium (transeetion metal)
Dubnium (transeetion metal)
Seaborgium (transeetion metal)
Bohrium (transeetion metal)
Hassium (transeetion metal)
Meitnerium (unkent chemical properties)
Darmstadtium (unkent chemical properties)
Roentgenium (unkent chemical properties)
Copernicium (transeetion metal)
Ununtrium (unkent chemical properties)
Flerovium (post-transeetion metal)
Ununpentium (unkent chemical properties)
Livermorium (unkent chemical properties)
Ununseptium (unkent chemical properties)
Ununoctium (unkent chemical properties)


Atomic nummer (Z) 53
Group, block group 17 (halogens), p-block
Period period 5
Element category   diatomic nonmetal
Staundart atomic wicht (Ar) 126.90447
Electron configuration [Kr] 4d10 5s2 5p5
per shell
2, 8, 18, 18, 7
Pheesical properties
Phase solid
Meltin pynt 386.85 K ​(113.7 °C, ​236.66 °F)
Bylin pynt 457.4 K ​(184.3 °C, ​363.7 °F)
Density near r.t. 4.933 g/cm3
Threeple pynt 386.65 K, ​12.1 kPa
Creetical pynt 819 K, 11.7 MPa
Heat o fusion (I2) 15.52 kJ/mol
Heat o vapourisation (I2) 41.57 kJ/mol
Molar heat capacity (I2) 54.44 J/(mol·K)
vapour pressur (rhombic)
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 260 282 309 342 381 457
Atomic properties
Oxidation states 7, 5, 3, 1, -1
(strongly acidic oxide)
Electronegativity Pauling scale: 2.66
Atomic radius empirical: 140 pm
Covalent radius 139±3 pm
Van der Waals radius 198 pm
Creestal structur orthorhombic
Orthorhombic crystal structur for iodine
Thermal conductivity 0.449 W/(m·K)
Electrical resistivity 1.3×107 Ω·m (at 0 °C)
Magnetic orderin diamagnetic[1]
Bouk modulus 7.7 GPa
CAS Nummer 7553-56-2
Diskivery Bernard Courtois (1811)
First isolation Bernard Courtois (1811)
Maist stable isotopes o iodine
iso NA hauf-life DM DE (MeV) DP
123I syn 13 h ε, γ 0.16 123Te
124I syn 4.176 d ε - 124Te
125I syn 59.40 d ε - 125Te
127I 100% - (SF) <29.961
129I trace 1.57×107 y β 0.194 129Xe
131I syn 8.02070 d β, γ 0.971 131Xe
135I syn 6.57 h β - 135Xe
Decay modes in parentheses are predictit, but hae nae yet been observed
· references

Iodine is a chemical element wi seembol I an atomic nummer 53. The name is frae Greek ἰοειδής ioeidēs, meanin violet or purpie, due tae the colour o elemental iodine vapor.[2]

References[eedit | eedit soorce]

  1. Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.
  2. Online Etymology Dictionary, s.v. iodine. Retrieved 2012-02-07.