The 49th element is indium, another metal with a silvery white appearance. Like Cadmium, indium is a soft metal. It has a low melting point - 156°C and can be mixed with gallium to make an alloy which is liquid at room temperature
It is used for making some electronic components, as a replacement for silver in mirrors and as a solder.
The name indium comes from the word indigo. Indigo is a dark blue colourful often cited as being one of the rainbow colours.
Experiment of the week
Investigate the colour indigo
You will need:
a light source, the sun or a light bulb
A CD
Adult supervision
What to do:
shine the light on the back of the CD
You should see all the colours of the rainbow as the light is split into its constituent colours.
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