How to pass a Plane of symmetry?

While passing a plane of symmetry through any compound inorganic or organic should it contain a minimum number of atoms or can it be passed without containing any atoms ?


![](https://i.stack.imgur.com/xQJ6x.jpg)




**Yes** , the plane of symmetry need not cross/pass through any atoms. 
The compound that you've drawn can show *cis*-*trans* isomerism. I believe you're talking about the *cis* form.


1. The *cis* form will have a plane of symmetry  

![cis-1,2-dichlorocyclohexan](https://i.stack.imgur.com/eJUYf.png)
2. The *trans* form will not have a plane of symmetry  

![trans-1,2-dichlorocyclohexan](https://i.stack.imgur.com/Inyhd.png)


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