Ab两元素均位于�期表中第三�期它们的原子核外最外层电子数之和为7其中a元素的原子核外最外层电子数为1个两者间可形成化合物a2b.根据 Template




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tomskiab两元素均位于�期表中第三�期它们的原子核外最外层电子数之和为7其中a元素的原子核外最外层电子数为1个两者间可形成化合物a2b.根据 coloring