Symbol: I
Atomic Number: 53
Atomic Weight: 126.90447
Element Classification: Halogen
Discovered By: Bernard Courtois
Discovery Date: 1811 (France)
Name Origin: Greek: iodes (violet colored).
Density (g/cc): 4.93
Melting Point (K): 386.7
Boiling Point (K): 457.5
Appearance: Shiny, black nonmetallic solid
Atomic Radius (pm): n/a
Atomic Volume (cc/mol): 25.7
Covalent Radius (pm): 133
Ionic Radius: 50 (+7e) 220 (-1e)
Specific Heat (@20°C J/g mol): 0.427 (I-I)
Fusion Heat (kJ/mol): 15.52 (I-I)
Evaporation Heat (kJ/mol): 41.95 (I-I)
Thermal Conductivity (@25°C W/m K):
Debye Temperature (K): n/a
Pauling Negativity Number: 2.66
First Ionizing Energy (kJ/mol): 1008.3
Oxidation States: 7, 5, 1, -1
Electronic Configuration: [Kr] 4d¹⁰ 5s² 5p⁵
Lattice Structure: Orthorhombic (ORC)
Lattice Constant (Å): 7.720
Lattice C/A Ratio: n/a