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| tran·si·tion el·e·ment (plural tran·si·tion el·e·men·ts) or tran·si·tion met·al (plural tran·si·tion met·als) |
noun |
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| Definition: |
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metallic element: a metallic element such as copper or gold that has an incomplete penultimate electron shell and variable valences, and typically forms colored compounds
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