- any element belonging to one of three series of elements with atomic numbers between 21 and 30, 39 and 48, and 57 and 80. They have an incomplete penultimate electron shell and tend to exhibit more than one valency and to form complexes
| 单词 | transition element |
| 释义 | WordReference Random House Unabridged Dictionary of American English © 2024 transi′tion el′ement, [Chem.]
Collins Concise English Dictionary © HarperCollins Publishers:: transition element, transition metal n
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