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过渡元素
一类金属元素,这些元素最外层的8个电子未填满,导致倒数第二层有8到18或32个电子。这此元素包括21至29号元素(钪至铜),39至47号元素(钇至银),57至79号元素(镧至金),以及89号以后的所有已知的元素。
guòdù yuánsù
environ.
trantsizio-elementu
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