Chinese 稀土元素 Cited by user Hacter Chang on 01 Sep 2022 稀土元素(rare-earth element,REE),或称稀土金屬,是元素周期表上第Ⅲ族之钪、钇和镧系元素共17种金屬化學元素的合称,皆屬於副族元素. 稀土元素皆為質地較軟的銀白色金屬,彼此之間具有非常相似的化学性质,且總是在矿床中共生,難以分離、提取.
Romanian Carl Auer von Welsbach Cited by user Luzomim on 15 Dec 2018 dreapta|miniatura|Castelul Auer von Welsbach din [[Mölbling, Austria]] Carl Auer von Welsbach, cunoscut și sub numele de Carl Auer, Freiherr von Welsbach, a fost un om…