> I am trying to saturate the dangling bonds on a slab by hydrogens. in 
> build-->add hydrgen, the hydrogen is only added to one of the atoms and then 
> clicking on the others do not work.

The "Add Hydrogens" menu item should add to all "missing" valences. That said, 
it's not necessarily perfect. It has a set of empirical rules, largely 
determined by organic molecules. Could you share the slab or material you are 
trying to add hydrogens?

-Geoff
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