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‖ thorinum Chem. Obs.|θɒˈraɪnəm|
[f. F. thorine and Eng. thorina, in accordance with L. names of metals in -um, as aurum, cuprum, plumbum.]
1. The name originally given to a hypothetical metal of which thorina (sense 1) was (erroneously) supposed by Berzelius, 1815, to be the oxide.
1819J. G. Children Ess. Chem. Anal. §76 Oxide of Thorinium, or Thorina. 1820Ure Dict. Chem., Thorinum, the supposed metallic basis of the preceding earth [thorina 1], not hitherto extracted. 1826Henry Elem. Chem. I. 635 Thorinum. Nothing is known of the metallic base of this earth [thorina], and it is only from analogy that it is supposed to be constituted of such a base united with oxygen.
2. The name given in France and England, for several years after 1828, to the metallic element thorium, q.v.
1836Brande Chem. (ed. 4) 847 Thorinum..was discovered by Berzelius in 1828, in a rare and complex mineral, found in the Syenitic rock of the Isle of Lövon, near Brevig, in Norway. It contained about 58 per cent. of thorina. Ibid., By passing a current of dry chlorine over a mixture of thorina and charcoal-powder, a crystalline chloride of thorinum is obtained, which is easily decomposed by potassium, and the product is thorinum. It is of a gray colour, metallic lustre, and apparently malleable. 1873Watts Fownes' Chem. (1877) I. 397 Thorinum forms but one class of compounds, in all of which it is quadrivalent. |