transition element One of a group of metallic elements in which the members have the filling of the outermost shell to 8 electrons interrupted to bring the penultimate shell from 8 to 18 or 32 electrons; includes elements 21 through 29 (scandium through copper), 39 through 47 (yttrium through silver), 57 through 79 (lanthanum through gold), and all known elements from 89 (actinium) on

environ.

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。)

transition element

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