7.现有abcd四种短�期元素已知ab同主族bcd同�期ab的原子序数之和等于cd的原子序数之和c的单质能分别跟b和d Template




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tomski7.现有abcd四种短�期元素已知ab同主族bcd同�期ab的原子序数之和等于cd的原子序数之和c的单质能分别跟b和d coloring