Indium Facts - Periodic Table of the Elements

Indium Facts - Periodic Table of the Elements Indium  Basic Facts Atomic Number: 49 Symbol: In Atomic Weight: 114.818 Discovery: Ferdinand Reich and T. Richter 1863 (Germany) Electron Configuration: [Kr] 5s2 4d10 5p1 Word Origin: Latin indicum. Indium is named for the brilliant indigo line in the spectrum. Isotopes: Twenty-three isotopes of indium are known. Only one stable isotope, In-127, occurs naturally. Properties: The melting point of indium is 156.61  °C, boiling point is 2080  °C, specific gravity is 7.31 (20  °C), with a valence of 1, 2, or 3. Indium is a very soft, silvery-white metal. The metal has a brilliant luster and emits a high pitched sound when bent. Indium wets glass. Indium may be toxic, but further research is required to assess its effects. Uses: Indium is used in low melting point alloys, making bearing alloys, transistors, thermistors, photoconductors, and rectifiers. When plated or evaporated onto glass, it forms a mirror as good as that formed by silver, but with superior resistance to atmospheric corrosion. Sources: Indium often is associated with zinc materials. It is also found in iron, lead, and copper ores. Element Classification: Metal Indium Physical Data 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 Debye Temperature (K): 129.00 Pauling Negativity Number: 1.78 First Ionizing Energy (kJ/mol): 558.0 Oxidation States: 3 Lattice Structure: Tetragonal Lattice Constant (Ã…): 4.590    References: Los Alamos National Laboratory (2001), Crescent Chemical Company (2001), Langes Handbook of Chemistry (1952), CRC Handbook of Chemistry Physics (18th Ed.)    Return to the Periodic Table Chemistry Encyclopedia