鈥,化學元素也,符號為Ho,原子序六十七。屬鑭系元素、稀土金屬。
一八七八年,瑞典化學家克勒韋(Per Teodor Cleve)初得其氧化物,蓋取自稀土礦也。
鈥元素性柔軟,色銀白,易於燃燒。濕氣之中,極為活潑,敏於腐蝕,故自然中不以獨存;苟以獨取,存於室溫之下、乾燥之境,則幾可自存。
鈥出於獨居石、矽鈹釔礦。商業之中,多以離子交換法,取於獨居石。氧化態以正三為最常,其化合物,無論天然人造皆然。以熒光故,用諸激光、玻璃著色等。
諸磁之中,以鈥為最,恒而至強。是以最強永磁,往往以鈥為心。鈥亦強於攝取中子,遂用諸核反應堆。
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