51 Sb 锑 Antimony52 Te 碲 Tellurium53 I 碘 Iodine54 Xe 氙 Xenon55 Cs 铯 Cesium56 Ba 钡 Barium57 La 镧 Lanthanum58 Ce 铈 Cerium59 Pr 镨 Praseodymium60 Nd 钕 Neodymium
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