Name indium
Symbol In
Atomic Weight 114.818
Atomic Number 49
CAS ID 7440-74-6
Group Number 13
Group Name (none)
Period Number 5
Origin of Name Named after the indigo line in its spectrum.
Year Discovered 1863
Discovery Credits Discovered by Ferdinand Reich and Hieronymous Richter at Frieberg, Germany.
Class Metallic
Color Silvery Lustrous Gray
Standard State Solid at 77 F & 298 K
Description Soft, silvery-white metal. Stable in air and with water, dissolves in acids. Used in low melting alloys in safety devices. Semiconductor uses as InAs and InSb in transistors, thermistors, etc.

Diagnostic tests: 
there are no simple chemical tests for indium. Atomic Absorption Spectroscopy is used for quantitative analysis and Energy Dispersive Analysis of X-rays (EDAX) is used for qualitative analysis.

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