推荐回答（5个）
同素异形体是指同种元素的不同单质 注意 它们是单质 换句话说 它是物质 比如 石墨和金刚石，它们是物质把？而不只是一种元素把？所以它们是同素异形体
而同位素是中子数不同但质子数相同的同种元素 注意 它只是元素 比如 没有中子的H1和有一个中子的2H 或者 C12和C14 那么它们只是元素而已 它们不是单独的物质 所以 它们是同位素
H2和H3的话 如果你的意思是 H3是3个氢原子 H2是两个氢原子 那么它们是不同的物质 它们是同素异形体
而如果你的意思是 H3是指质量数为3的H元素 那么它们是元素 是同位素
实际中 应该是没有H3 即3个H原子的分子的 所以你的意思应该是同位素把？题目表达地不是很清楚
各种元素之间的区别就是含质子数不同，含质子数相同的就是同一种元素了。
同位素就是同种元素，只不过中子数不同，所以原子量不同。
同素异形体顾名思意就同一种元素的不同形态了，如金刚石和石墨，氧和臭氧——————
同素异形体针对的是物质形态，同位素针对的是元素中子量
很明显H3和H2是同素异形体关系
同素异形体是相同元素构成,不同形态的单质
具有相同质子数，不同中子数（或不同质量数）同一元素的不同核素互为同位素。
同素异形体针对的是物质，同位素针对的是元素
H3和H2是同素异形体。
同素异形体是不同的物质（也就是由不同的分子构成），他们含有相同的元素，如H3和H2都含有H原子。而同位素是同一种原子中的中子数不同，如C12和C13,C12表示中子数为12的碳原子，C13表示中子数为13的碳原子。但他们是同一种原子。
精彩答区：
同位素：比如C12、C13、C14 ---同种原子但含的中子数不同。
同素异形体：比如金刚石、石墨。--同种元素形成的的不同种单质。
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