Iodine

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Iodine,  53I
Sample of iodine.jpg
General properties
Appearance lustrous metallic gray, violet as a gas
Staundart atomic wecht (Ar, staundart) 126.90447(3)
Iodine in the periodic cairt
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Airn Cobalt Nickel Capper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Siller (element) Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercur (element) Thallium Leid (element) Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Ununtrium Flerovium Ununpentium Livermorium Ununseptium Ununoctium
Br

I

At
telluriumiodinexenon
Atomic nummer (Z) 53
Group group 17 (halogens)
Period period 5
Element category   diatomic nonmetal
Block p-block
Electron confeeguration [Kr] 4d10 5s2 5p5
Electrons per shell
2, 8, 18, 18, 7
Pheesical properties
Phase (at STP) solit
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
Treeple 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
Color lines in a spectral range
Miscellanea
Creestal structurorthorhombic
Orthorhombic creestal 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
History
Diskivery Bernard Courtois (1811)
First isolation Bernard Courtois (1811)
Main isotopes o iodine
Iso­tope Abun­dance Hauf-life (t1/2) Decay mode Pro­duct
123I syn 13 h ε, γ 123Te
124I syn 4.176 d ε 124Te
125I syn 59.40 d ε 125Te
127I 100% - (SF)
129I trace 1.57×107 y β 129Xe
131I syn 8.02070 d β, γ 131Xe
135I syn 6.57 h β 135Xe
Decay modes in parentheses are predictit, but hae nae yet been observed
| references | in Wikidata

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.