abcd四种短�期元素原子序数d>a>b>c且ab同�期cd同主族a的原子结构示意图为bc可形成离子化合物b3c2 Template




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tomskiabcd四种短�期元素原子序数d>a>b>c且ab同�期cd同主族a的原子结构示意图为bc可形成离子化合物b3c2 coloring