[PyMOL] Mutating an Ion in Pymol and Displaying van der waals Radii

[Buz Barstow]

Dear All,

I'd like to mutate an ion in pymol from a potassium to a sodium. Is  
there an easy way to do this from the command line without having to  
edit the pdb file of the structure?

Also, when one displays an atom (for instance a K atom) using the  
spheres representation, is the radius of the sphere equal to the  
Pauling radius of the atom (under the assumption that it is ionized)?  
For K, it looks like it is.

Thanks! and all the best,

--Buz