20.已知abcde是短�期的五种元素它们的原子序数依次增大a元素原子形成的离子核外电子数为零cde三种元素的最高价氧化物 Template




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tomski20.已知abcde是短�期的五种元素它们的原子序数依次增大a元素原子形成的离子核外电子数为零cde三种元素的最高价氧化物 coloring