Why is sulfur the central atom in the Lewis structure for SO2?

So apparently the Lewis structure of $\ce{SO\_2}$ is


![enter image description here](https://i.stack.imgur.com/G0Zl3.png)


It was my understanding that the central atom is the one that is more electronegative. And an atom is more electronegative the closer it is to Fluorine (top-right). Oxygen is definitely closer to fluorine than sulfur is. Then, why is sulfur the central atom?


Also, one thing that has been bugging me for a while: if there are two or more atoms for the central element, how do you make the Lewis structure?




I think you messed up something. Because it is exactly opposite.


"Central part of atom is normally **least**(not the most) electronegative atom i.e. **S** in this case. 


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For polyatomic molecule least electronegative polyvalent atom acts as central atom and by using this we wlll get most plausible structure (structure having least magnitude of formal charge) for polyatomic molecule. 


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