� 元素的相对原子质量是其各种同位素的相对原子质量的平均值而几乎所有的元素都有同位素 � Be元素位于�期表中�属与非�属元素的分界线附� Template




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tomski� 元素的相对原子质量是其各种同位素的相对原子质量的平均值而几乎所有的元素都有同位素 � coloring