Abcd为四种短�期主族元素且原子序数依次增大.已知a的最外层电子数 是其电子层数的2倍b是地壳中含量最高的元素b原子的最外层电子 Template




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tomskiabcd为四种短�期主族元素且原子序数依次增大.已知a的最外层电子数 是其电子层数的2倍b是地壳中含量最高的元素b原子的最外层电子 coloring