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Se和
Se互为同素异形体 Se和Se互为同位素 Se和Se分别含有44和46个质子 Se和Se都含有34个中子
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H2O(1)＞H2S(1)＞H2Se(1)； H2O(1)＞H2Se(1)＞H2S(1)； H2O(1)＜H2S(1)＜H2Se(1)； H2O(1)＜H2Se(1)＜H2S(1)。
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X-1．96SE≥XT X-1．96SE≌XT≌X+1． 96SE X+1．96SE≤XT X-1．96SE＜XT≤X+1．96SE
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