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一、何謂“稀土”在地球上,包括金、银、铜、铁、锡……碳、硅、锰、硫、磷……在内,一共103个元素。按原子结构的规律,把它们排成元素周期表。在这个表中有一个元素叫“镧”,与镧的原子结构十分相似的还有铈、镨等14个元素(排在周期表的下面)。这15个元素统称镧系元素,也叫稀土元素。与镧系元素相似的还有二个元素——钪和镱,因此,一般说的稀土元素共有17个。
First, what is “rare earth” on Earth, including gold, silver, copper, iron and tin ... ... a total of 103 elements, including carbon, silicon, manganese, sulfur and phosphorus. According to the laws of the atomic structure, put them into the periodic table. In this table there is an element called “lanthanum”, very similar to the atomic structure of lanthanum and cerium, praseodymium and other 14 elements (in the periodic table below). These 15 elements are collectively referred to as lanthanides, also known as rare earth elements. Similar to the lanthanides there are two elements - scandium and ytterbium, therefore, in general, a total of 17 rare earth elements.