已知abcdef都是�期表中前四�期的元素它们的核电荷数a<b<c<d<e<f.其中a原子核外有三个未成对电子化合物b2e的晶体 Template




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tomski已知abcdef都是�期表中前四�期的元素它们的核电荷数a<b<c<d<e<f.其中a原子核外有三个未成对电子化合物b2e的晶体 coloring