New answers tagged history-of-chemistry
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One of the oldest reputable sources that I managed to find allowing to define what "uraneous oxide" is, was Roscoe's Lessons in Elementary Chemistry [1, p. 253] (strong emphasis mine):
URANIUM.
Symbol U, Combining Weight 240, Specific Gravity 18·4.
Uranium is a metal which occurs but sparingly in nature, existing combined in two somewhat rare ...
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