Thorium dioxide | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-10-21

This is an audio version of the Wikipedia Article:
Thorium dioxide

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SUMMARY
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Thorium dioxide (ThO2), also called thorium(IV) oxide, is a crystalline solid, often white or yellow in color. Also known as thoria,  it is produced mainly as a by-product of lanthanide and uranium production. Thorianite is the name of the mineralogical form of thorium dioxide. It is moderately rare and crystallizes in an isometric system. The melting point of thorium oxide is 3300 °C – the highest of all known oxides. Only a few elements (including tungsten and carbon) and a few compounds (including tantalum carbide) have higher melting points.  All thorium compounds are radioactive because there are no stable isotopes of thorium.