noun🔗Share镧系元素 Any of the 14 rare earth elements from cerium (or from lanthanum) to lutetium in the periodic table; because their outermost orbitals are empty, they have very similar chemistry; below them are the actinides."Chemists studying the properties of the lanthanides group them together because these elements behave similarly in chemical reactions. "化学家在研究镧系元素的性质时，通常将它们归为一组，因为这些元素在化学反应中的表现非常相似。elementchemistryscienceChat with AIVocabulary GamePractice Reading
