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碱金属是指在元素周期表中同属第1族（舊稱ⅠA族）的六个金属元素：锂（Li）、钠（Na）、钾（K）、铷（Rb）、铯（Cs）、钫（Fr），其中钫具有強烈的放射性。
碱金属均有一个属于s轨道的最外层电子，...