abcd是原子序数依次增大的四种短�期主族元素ab的简单离子具有相同电子层结构b 与d形成的离子化合物是日常生活中常用的调�品a Template




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tomskiabcd是原子序数依次增大的四种短�期主族元素ab的简单离子具有相同电子层结构b 与d形成的离子化合物是日常生活中常用的调�品a coloring