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Thorium is an electropositive actinide whose chemistry is dominated by the 4 oxidation state; it is quite reactive and can ignite in air when finely divided. The most stable isotope, It is estimated to be over three times more abundant than uranium in the Earth's crust, and is chiefly refined from monazite sands as a by-product of extracting rare-earth metals.Thorium was discovered in 1829 by the Norwegian amateur mineralogist Morten Thrane Esmark and identified by the Swedish chemist Jöns Jacob Berzelius, who named it after Thor, the Norse god of thunder.EU diplomats hit back at the threat by telling the paper they would have 'the coastguard ready'.The warning come as Theresa May has faced a growing threat of revolt from her backbenchers over Britain's relationship with the EU on nuclear issues after Brexit.In the second half of the century, thorium was replaced in many uses due to concerns about its radioactivity.Thorium was formerly used as an alloying element in TIG welding electrodes, as a material in high-end optics and scientific instrumentation, and as the light source in gas mantles, but these have become marginal uses.The boar was shot in Augustin the Gävle in the centre-east of Sweden where the ecosystem was hit hard by the Chernobyl fallout.
Thorium metal is silvery and tarnishes black when it is exposed to air, forming the dioxide; it is moderately hard, malleable, and has a high melting point.
Britain has reportedly warned the EU that it could send radioactive waste black to the bloc if Brexit talks turn sour.
UK officials have got tough with their counterparts in Brussels by telling them that nuclear material could be shipped back to Germany, Italy and other EU countries.
At room temperature, thorium metal has a face-centred cubic crystal structure; it has two other forms, one at high temperature (over 1360 °C; body-centred cubic) and one at high pressure (around 100 GPa; body-centred tetragonal).
Thorium metal has a bulk modulus (a measure of resistance to compression of a material) of 54 GPa, about the same as tin's (58.2 GPa).