前四�期元素abcdef原子序数依次增大其中a和b同�期固态的ab2能升华c和e原子都有一个未成对电子c 比e �一个电子 Template




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tomski前四�期元素abcdef原子序数依次增大其中a和b同�期固态的ab2能升华c和e原子都有一个未成对电子c 比e �一个电子 coloring