Indium - Periodic Table of the Elements

FACULTY OF CHEMICAL TECHNOLOGY IN SPLIT
PERIODIC TABLE OF THE ELEMENTS version 1.7


 In

English:  Indium
French: Indium
Croatian: Indij
German: Indium
Italian: Indio


Atomic number: 49
Group numbers: 13
Period: 5
Standard state (20 °C): solid

Indium was discovered by Ferdinand Reich and Hieronymus Theodor Richter (Germany) in 1863. Named after the indicum (colour indigo), the colour it shows in a spectroscope. It is rare, very soft, silver-white metal. Stable in air and water. Dissolves in acids. Metal can ignite and burn.

Electronic configuration: [Kr] 4d¹⁰ 5s² 5p¹
Relative atomic mass: 114.818(3)
Formal oxidation number: +3

Electronegativities: 1.78
Thermal conductivity: 81.6 W/(m K)
Electrical resistivity (20 °C): 8.37 μΩcm

Atomic radius: 162.6 pm
Density (g/dm3): 7310 (298 K) 
7032 (m.p.)
Molar volume (cm3/mol): 15.71 (298 K) 
16.33 (m.p.)

Melting point: 156.6 °C
Boiling point: 2072 °C
Critical temperature: 6457 °C

Heat of fusion: 3.27 kJ/mol
Heat of vaporization: 231.8 kJ/mol
Heat of atomization: 243.72 kJ/mol

Indium is found in certain zinc ores. Used to coat high speed bearings and as an alloy that lowers the melting point of other metals. Relatively small amounts are used in dental items and in electronic semiconductors. The price of 99.9 % pure indium shot is 400.30 € for 250 g. 48Cd <= 49In => 50Sn ___________________ If you have comments, corrections or suggestions about this site, please send me a e-mail. Periodic Table of the Elements __________________________________ Last modified: 29.03.2003 Copyright © 1998-2003 by Eni Generalic