题目内容
有一种衰变叫EC衰变,EC衰变发生于核内中子数相对过少的放射性原子核.核内的一个质子(
)可以俘获一个核外电子(
)并放射出一个中微子而转变为一个中子(
).经过一次EC衰变后原子核的( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134723182349.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134723213366.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134723260387.png)
A.质量数不变,原子序数减少1 | B.质量数增加1,原子序数不变 |
C.质量数不变,原子序数不变 | D.质量数减少1,原子序数减少1 |
A
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134723182349.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134723213366.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134723260387.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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