abcde五种元素位于�期表的前四�期原子序数依次增大.a元素可以形成 1价离子bd最外层电子数都是电子层数的2倍c原子基态时 Template




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tomskiabcde五种元素位于�期表的前四�期原子序数依次增大.a元素可以形成 1价离子bd最外层电子数都是电子层数的2倍c原子基态时 coloring