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Indium In
Where is indium used--or where does it impact our everyday lives?
Indium symbol: In
Atomic number: 49 Atomic Mass: 114.8
Group number: 13 Period number: 5
Melting point 156.6 oC (313.88 oF)
Boiling point 2072 oC (3761.6 oF)
Indium does not react with air.
Indium does not react with water.
Electron configuration: 2, 8, 18, 18, 3 [Kr] 4d10 5s2 5p1
Source: LANL.gov
Researcher: Frances M.
Compounds of indium with semimetals such as arsenic allow indium to be used in LEDs, light-emitting diodes. See a video of the red LED during a Chemistry One lab investigating the properties of metals, non-metals and metalloids. The testing instrument for electrical conductivity has a green and red LED. The sample of silicon in the movie lights the diodes in the tester confirming the electrical conductivity of the metalloid silicon.
See the VIDEO of the use of red LEDs with aluminum gallium arsenide, AlGaAs, and aluminum gallium indium phosphide (AlGaInP)
and ANOTHER VIDEO incuding testing magnesium and silicon for electrical conductivity
Indium with copper and selenium are used in compounds such as CuInSe2 for use in solar panels. Some solar panels are also made of gallium arsenide, GaAs, and others are CdTe, cadmium telluride
The photo shows solar panesl on the roadside of the I-95 north in Virginia, USA
WIS Photographer
Orange LED lights can be made of aluminium gallium indium phoshide
WIS Photographer
