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鹼金屬係元素週期表嘅第一組,即係最外邊嘅電子殼只有一粒電子,全部都係金屬。
由於最外邊嘅電子殼只有一粒電子,呢粒電子好唔穩定,容易甩出去,做成正離子。所以鹼金屬係最容易發生化學反應嘅組別。因為咁,鹼金屬放響水度會有激嘅反應,會好快取代水分子裏面,其中一粒氫原子,令到水變成鹼性,所以叫佢做鹼金屬。
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