一个特定元素的同位素具有相同的化学特征，但在物理性质上有一些细微差异。
The isotopes of a given element have the same chemical properties but slightly different physical properties.
人们提出了各种建议，根据化学和物理性质的相似性把这些元素分组。
Various proposals were put forth to arrange the elements into groups based on similarities in chemical and physical properties.
这两位化学家都非常有远见，他们对周期性的物理性质和化学性质进行分析，并在预示应该出现新元素的地方留下了空位。
Both chemists were sufficiently farsighted to leave gaps where their analyses of periodic physical and chemical properties indicated that new elements should be located.
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