有下列符号:35Cl和37Cl、O2和O3、1H216O和2H218O。下列有关说法正确的是

有下列符号:35Cl和37Cl、O2和O31H216O和2H218O。下列有关说法正确的是  (    )

       A.35Cl和37Cl互称为同素异形体        B.O2和O3是氧元素的两种同位素

       C.35和37表示的是质量数             D.1H216O和2H218O表示同一种水分子

答案

C

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