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主要是因為有同位素的存在.具有相同質子數,不同中子數(或不同質量數)同一元素的不同核素互為同位素. 例如,氫元素有3種同位素氕氘氚三種同位素,即氫1,氫2,氫3,他們質子數都等於1,但中子數分別為0,1,2,中子數不同,所以是不同的原子.再比如氧元素也有氧16和氧18兩種同位素.
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