元素发现的历程早在18世纪，人们在科学实验和生产实践中就发现了氢、氮、钛、铬、铜等28种化学元素。到了19世纪，人们通过电解、化学分析和光谱分析等技术又发现了40多种元素。1869年2月，俄国化学家门捷列夫将当时已发现的63种元素列成元素周期表，并留下一些空格，预示着这 The process of element discovery dates back to the 18th century, and 28 chemical elements such as hydrogen, nitrogen, titanium, chromium, and copper have been discovered in scientific experiments and production practices. In the 19th century, more than 40 elements were discovered through electrolysis, chemical analysis, and spectral analysis. In February 1869, the Russian chemist Mendeleev listed the 63 types of elements that had been discovered at the time as the periodic table of elements and left some spaces indicating that