for which这里的 怎么理解 There have been atomic number,for which there is no known element.

问题描述:

for which这里的 怎么理解 There have been atomic number,for which there is no known element.

有一些原子序数没有已知的对应元素.
(可能是用某些实验得出了一个元素的atomic number 结果找不到已知相应的元素 那么有可能就是发现了一种新元素 或者实验错误)
讲的繁琐一点就是
there have been atomic numbers[←我觉得应该要有s],and there's no known element for such atomic numbers.
atomic number和element之间介词用for
在这个which的定语从句里面 就把介词放到which之前
有问题就追问吧