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May 12 2012 7 12 /05 /May /2012 12:49

Thallium is a highly toxic element which had its primary household source (thallium sulfate in rat poison) banned in the 1970s due to its extreme toxicity. Thallium minerals can be obtained, as well as thallium metal, but both are rare and highly expensive. Back when mercury thermometers were legal, thallium was added as an 8% alloy to lower the freezing point, making the thermometer more useful in cold conditions.

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Published by LanthanumK - in Elements
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