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It has been suggested as a replacement for uranium as nuclear fuel in nuclear reactors, and several thorium reactors have been built.

Thorium is a moderately soft, paramagnetic, bright silvery radioactive actinide metal.

The UK Department for Business, Energy and Industrial Strategy said negotiations would focus on the 'legal ownership not physical location' of nuclear materials.

But Mrs May has insisted the UK must leave the agency on Brexit because so we can free ourselves from the jurisdiction of the European Court of Justice. Britain has the world's largest stockpile of civilian plutonium at Sellafield, but a plant built at the site to recycle the plutonium into new nuclear fuel was closed in 2011 because of technological flaws.While the area's elk and reindeer population's radiation levels have steadily decreased over the years, radioactivity among boars appears to be on the rise.It is thought this could be due to boars migrating north to areas that have been more affected by the fallout.In the beginning of period 7, from francium to thorium, the melting points of the elements increase (as in other periods), because the number of delocalised electrons each atom contributes increases from one in francium to four in thorium, leading to greater attraction between these electrons and the metal ions as their charge increases from one to four.After thorium, there is a new downward trend in melting points from thorium to plutonium, where the number of f electrons increases from about 0.4 to about 6: this trend is due to the increasing hybridisation of the 5f and 6d orbitals and the formation of directional bonds resulting in more complex crystal structures and weakened metallic bonding. Addition of small proportions of thorium improves the mechanical strength of magnesium, and thorium-aluminium alloys have been considered as a way to store thorium in proposed future thorium nuclear reactors.

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