Researchers have produced the lightest version of a uranium atom ever. It has only 122 neutrons compared with the 146 neutrons found in more than 99 per cent of the world’s naturally occurring uranium, which is known as uranium-238.

This new isotope of uranium has the lowest number of neutrons ever at 214, making it uranium-214.

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https://www.newscientist.com/article/2274847-physicists-have-created-a-new-and-extremely-rare-kind-of-uranium/#ixzz6sFMLcxT2

Source: New Scientist