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（9分）、下图是元素周期表的短周期部分，序号 a ～ h 代表8种常见元素。 IA[ O族 第一周期 a IIA IIIA IVA VA VIA VIIA 第二周期 b c d 第三周期 e f[ g h 请用相应的化学用语回答下列问题： （1）画出g原子结构示意图________。 （2）写出元素 h 的单质与元素 a 、 c 形成的简单化合物发生置换反应的化学方程式___________________。 （3）写出 f 单质与 a 、 d 、 e 三种元素形成的化合物水溶液反应的化学方程式__________。 （4）a、b元素形成的最简单化合物与d单质可组成燃料电池（以KOH溶液作电解质溶液），写出正极的电极反应式：_____________，负极发生______反应（填“氧化”或“还原”），OH － 移向____极。
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