SAT2化学题One reason why certain isotopes have an unstable nucl

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SAT2化学题
One reason why certain isotopes have an unstable nucleus is because the number of
A质子比中子多
B电子比质子多
C中子比电子多
D质子比电子多
E中子比质子多
答案是英文的,

应该是e中子比质子多吧,中子更易衰变成质子和电子些.首先原子核与电子无关,bcd排除,再自己举一下例子,氢的核素氕比氘和氚要稳定些,碳12比碳14稳定些,重核中中子往往比质子多且重核通常不稳定,所以中子比质子多导致原子核不稳定.

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