6.有abcde五种短�期元素它们的原子序数依次增大已知a和cb 和d分别位于同一主族且b和d质子数之和是a和c质子数之和的 Template




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tomski6.有abcde五种短�期元素它们的原子序数依次增大已知a和cb 和d分别位于同一主族且b和d质子数之和是a和c质子数之和的 coloring