Symbol I Atomic radius: pm 133 Fusion: kJ/Mole 15.52
Name Iodine Ionic radius: pm (-1)220 Boiling point: C 184
Atomic number 53 Electron affinity 3.06 Melting point: C 114
Atomic weight 126.9 1st  ion potential 10.45 Specific Heat Cap: J/(g K) 0.15
Classification Non-Metal Natural form Solid Thermal Cond: W/(cm K) 0.004
Configuration [Kr]4d105s2p5 Crystal structure Ortho Electrical Cond 8x10-16
Oxidation states +/-1,5,7 Density 4.92 Abundance: mg/kg-crust 0.45
Electronegativity 2.66 Vaporization: kJ/Mole 41.57    
Iodine was discovered in 1811 by Bernard Courtois. Uses - nutrient, antiseptic