What do LCDs, indigo and Krakatoa have in common?

This week's element is indium, which is represented by the symbol, In, and the atomic number, 49. It is a soft, malleable, lustrous silvery-white post-transition metal.

Indium, so named for the colour indigo, which is the brightest line in its atomic emission spectrum, is one of the rarest elements on earth. It was discovered in a sample of zinc,... 

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