Definitionn. a soft silvery-white tetravalent radioactive metallic element
Last update: August 28, 2015
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Some part, however, seems to be derived from Thorium, And H. [Please select]
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The mantle is made by dipping a cylinder of cotton net into a solution of nitrate of thorium and cerium, containing 99 per cent. [Please select]
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Some metals, as for instance, osmium, tantalum, thorium, and others, have been used, and others, also, with great success, so that the march of improvements is now going forward with rapid strides. [Please select]
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