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The first synthetic element

Figure 1 | Mendeleev’s periodic table. When Mendeleev devised his periodic table 150 years ago, he left spaces for elements that he thought were missing. The gap indicated by the dashed box is for element 43. Carlo Perrier and Emilio Segrè3 discovered this element, now known as technetium, in 1937. Credit: Science History Institute

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Nature 565, 570-571 (2019)



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