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            • 1．

              \(\rm{\rlap{_{92}}{^{235}}U}\)是重要的核工业原料，在自然界的丰度很低。\(\rm{\rlap{_{92}}{^{235}}U}\)的浓缩一直为国际社会所关注。下列有关\(\rm{\rlap{_{92}}{^{235}}U}\)的说法中正确的是\(\rm{(}\)　　\(\rm{)}\)

              A．\(\rm{\rlap{_{92}}{^{235}}U}\)原子核中含有\(\rm{92}\)个中子

              B．\(\rm{\rlap{_{92}}{^{235}}U}\)原子核外有\(\rm{92}\)个电子

              C．\(\rm{\rlap{_{92}}{^{235}}U}\)与\(\rm{\rlap{_{92}}{^{238}}U}\)互为同位素

              D．\(\rm{\rlap{_{92}}{^{235}}U}\)与\(\rm{\rlap{_{92}}{^{238}}U}\)互为同素异形体
              难度：较难
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            • 2． 下列属于同位素的是（　　）
              A．红磷和白磷
              B．
               
              1
              1
              H和
               
              2
              1
              H
              C．H2O和D2O
              D．
               
              16
              8
              O和
               
              18
              8
              O
              难度：中等
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