9族元素
9族元素（又称钴族元素）是指元素周期表上第9族个元素，垃拉8族元素搭10族元素之间，拉过去搭8族元素搭10族元素合称为ⅧB族元素。9族元素包含钴（Co）、铑（Rh）、铱（Ir）、鿏（Mt），侪是坚硬个银白色过渡金属，其中鿏为人造元素，具有极高个放射性。
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