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鑭系元素係第57號元素鑭到71號元素鑥15種元素嘅統稱。鑭系元素嘅外層同次外層嘅電子構型基本相同,電子逐一填充到4f軌道上。由於鑭系元素都係金屬,所以又可以同錒系元素統稱做f區金屬。鑭系元素用符號Ln表示。
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