Symbol: In
Atomic Number: 49
Atomic Weight: 114.818
Element Classification: Other Metal
Discovered By: Ferdinand Reich, T. Richter
Discovery Date: 1863 (Germany)
Name Origin: Latin: indicum (color indigo), the color it shows in a spectroscope.
Density (g/cc): 7.31
Melting Point (K): 429.32
Boiling Point (K): 2353
Appearance: Very soft, silvery-white metal
Atomic Radius (pm): 166
Atomic Volume (cc/mol): 15.7
Covalent Radius (pm): 144
Ionic Radius: 81 (+3e)
Specific Heat (@20°C J/g mol): 0.234
Fusion Heat (kJ/mol): 3.24
Evaporation Heat (kJ/mol): 225.1
Thermal Conductivity (@25°C W/m K):
Debye Temperature (K): 129.00
Pauling Negativity Number: 1.78
First Ionizing Energy (kJ/mol): 558.0
Oxidation States: 3
Electronic Configuration: [Kr] 4d¹⁰ 5s² 5p¹
Lattice Structure: Tetragonal (TET)
Lattice Constant (Å): 4.590
Lattice C/A Ratio: n/a