1937年Perrier和Segre用氘核轰击钼靶得到了43号元素,它是人类历史上第一个人工合成的放射性元素,命名为锝(Technetium),外文意思是“人造的”。在现代元素周期表中,Tc却是红色标记的天然放射性元素。十九世纪中,门捷列夫发现元素周期律时,曾经预言了“锝”的存在,并且把它命名为“类锰”(eka-manganese)。他指出:“类锰”的原子量应略小于钌,大约是100;它应能 In 1937, Perrier and Segre obtained the No. 43 element by bombarding a molybdenum target with a helium nucleus. It was the first artificially synthesized radioactive element in human history and was named Technetium, which means “artificial”. In the modern periodic table, Tc is a naturally-occurring red radioactive element. In the nineteenth century, when Mendeleev discovered the elemental periodicity, he once predicted the existence of “锝” and named it eka-manganese. He pointed out that the atomic weight of “manganese-like” should be slightly less than about 100, and it should be able to