有abcd四种元素a元素形成的 2价阴离子比氦的核外电子数多8个b元素的一种氧化物为淡黄色固体该固体遇到空气能生成a的单质c为 Template




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tomski有abcd四种元素a元素形成的 2价阴离子比氦的核外电子数多8个b元素的一种氧化物为淡黄色固体该固体遇到空气能生成a的单质c为 coloring