Neutrons have no repelling electric charge so they're easily captured by the iron group elements.
在核中形成中子中子不带电荷。
Iron group
原声例句
TED-Ed（视频版）
英语百科
Iron group
In chemistry and physics, the iron group refers to elements that are in some way related to iron. These elements are relatively abundant both on Earth and elsewhere in the universe. The term is ambiguous in different contexts, and almost obsolete in chemistry.
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