第Ⅴa族元素中的ab两种元素所在�期分别最多可排18和8种元素且b在a的上�期当a的原子序数为x时b的原子序数为 A.x 18 Template




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tomski第Ⅴa族元素中的ab两种元素所在�期分别最多可排18和8种元素且b在a的上�期当a的原子序数为x时b的原子序数为 a.x 18 coloring