'Yu+Chen'+Technetium+-+The+First+Man-made+Element

Technetium is the first man-made element discovered in 1936 by [|Carlo Perrier] and [|Emilio Segrè] when they were doing an experiment. Technetium looks similar to platinum and all its isotopes are radioactive. It is also the element with the lowest atomic number without any stable isotopes. One of its isotopes: Technetium-99, is used in nuclear medicine for a large number of diagnostic tests.

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